diff --git a/tests/commands/complete_multipart_upload.sh b/tests/commands/complete_multipart_upload.sh
new file mode 100644
index 0000000..0d35501
--- /dev/null
+++ b/tests/commands/complete_multipart_upload.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+complete_multipart_upload() {
+  if [[ $# -ne 4 ]]; then
+    log 2 "'complete multipart upload' command requires bucket, key, upload ID, parts list"
+    return 1
+  fi
+  log 5 "complete multipart upload id: $3, parts: $4"
+  error=$(aws --no-verify-ssl s3api complete-multipart-upload --bucket "$1" --key "$2" --upload-id "$3" --multipart-upload '{"Parts": '"$4"'}' 2>&1) || local completed=$?
+  if [[ $completed -ne 0 ]]; then
+    log 2 "error completing multipart upload: $error"
+    return 1
+  fi
+  log 5 "complete multipart upload error: $error"
+  return 0
+}
\ No newline at end of file
diff --git a/tests/commands/create_multipart_upload.sh b/tests/commands/create_multipart_upload.sh
new file mode 100644
index 0000000..b9b60d2
--- /dev/null
+++ b/tests/commands/create_multipart_upload.sh
@@ -0,0 +1,75 @@
+#!/usr/bin/env bash
+
+# initialize a multipart upload
+# params:  bucket, key
+# return 0 for success, 1 for failure
+create_multipart_upload() {
+  if [ $# -ne 2 ]; then
+    log 2 "create multipart upload function must have bucket, key"
+    return 1
+  fi
+
+  local multipart_data
+  multipart_data=$(aws --no-verify-ssl s3api create-multipart-upload --bucket "$1" --key "$2") || local created=$?
+  if [[ $created -ne 0 ]]; then
+    log 2 "Error creating multipart upload: $upload_id"
+    return 1
+  fi
+
+  upload_id=$(echo "$multipart_data" | jq '.UploadId')
+  upload_id="${upload_id//\"/}"
+  export upload_id
+}
+
+create_multipart_upload_params() {
+  if [ $# -ne 8 ]; then
+    log 2 "create multipart upload function with params must have bucket, key, content type, metadata, object lock legal hold status, " \
+      "object lock mode, object lock retain until date, and tagging"
+    return 1
+  fi
+  local multipart_data
+  multipart_data=$(aws --no-verify-ssl s3api create-multipart-upload \
+    --bucket "$1" \
+    --key "$2" \
+    --content-type "$3" \
+    --metadata "$4" \
+    --object-lock-legal-hold-status "$5" \
+    --object-lock-mode "$6" \
+    --object-lock-retain-until-date "$7" \
+    --tagging "$8" 2>&1) || local create_result=$?
+  if [[ $create_result -ne 0 ]]; then
+    log 2 "error creating multipart upload with params: $multipart_data"
+    return 1
+  fi
+  export multipart_data
+  upload_id=$(echo "$multipart_data" | grep -v "InsecureRequestWarning" | jq '.UploadId')
+  upload_id="${upload_id//\"/}"
+  export upload_id
+  return 0
+}
+
+create_multipart_upload_custom() {
+  if [ $# -lt 2 ]; then
+    log 2 "create multipart upload custom function must have at least bucket and key"
+    return 1
+  fi
+  local multipart_data
+  log 5 "additional create multipart params"
+  for i in "$@"; do
+    log 5 $i
+  done
+  log 5 "${*:3}"
+  log 5 "aws --no-verify-ssl s3api create-multipart-upload --bucket $1 --key $2 ${*:3}"
+  multipart_data=$(aws --no-verify-ssl s3api create-multipart-upload --bucket "$1" --key "$2" 2>&1) || local result=$?
+  if [[ $result -ne 0 ]]; then
+    log 2 "error creating custom multipart data command: $multipart_data"
+    return 1
+  fi
+  export multipart_data
+  log 5 "multipart data: $multipart_data"
+  upload_id=$(echo "$multipart_data" | grep -v "InsecureRequestWarning" | jq '.UploadId')
+  upload_id="${upload_id//\"/}"
+  log 5 "upload id: $upload_id"
+  export upload_id
+  return 0
+}
diff --git a/tests/commands/get_object.sh b/tests/commands/get_object.sh
index 6f98841..56604f2 100644
--- a/tests/commands/get_object.sh
+++ b/tests/commands/get_object.sh
@@ -2,7 +2,7 @@
 
 get_object() {
   if [ $# -ne 4 ]; then
-    echo "get object command requires command type, bucket, key, destination"
+    log 2 "get object command requires command type, bucket, key, destination"
     return 1
   fi
   local exit_code=0
@@ -16,12 +16,25 @@ get_object() {
   elif [[ $1 == 'mc' ]]; then
     error=$(mc --insecure get "$MC_ALIAS/$2/$3" "$4" 2>&1) || exit_code=$?
   else
-    echo "'get object' command not implemented for '$1'"
+    log 2 "'get object' command not implemented for '$1'"
     return 1
   fi
   log 5 "get object exit code: $exit_code"
   if [ $exit_code -ne 0 ]; then
-    echo "error putting object into bucket: $error"
+    log 2 "error getting object: $error"
+    return 1
+  fi
+  return 0
+}
+
+get_object_with_range() {
+  if [[ $# -ne 4 ]]; then
+    log 2 "'get object with range' requires bucket, key, range, outfile"
+    return 1
+  fi
+  error=$(aws --no-verify-ssl s3api get-object --bucket "$1" --key "$2" --range "$3" "$4" 2>&1) || local exit_code=$?
+  if [[ $exit_code -ne 0 ]]; then
+    log 2 "error getting object with range: $error"
     return 1
   fi
   return 0
diff --git a/tests/commands/get_object_tagging.sh b/tests/commands/get_object_tagging.sh
new file mode 100644
index 0000000..14b20c1
--- /dev/null
+++ b/tests/commands/get_object_tagging.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+get_object_tagging() {
+  if [ $# -ne 3 ]; then
+    log 2 "get object tag command missing command type, bucket, and/or key"
+    return 1
+  fi
+  local result
+  if [[ $1 == 'aws' ]]; then
+    tags=$(aws --no-verify-ssl s3api get-object-tagging --bucket "$2" --key "$3" 2>&1) || result=$?
+  elif [[ $1 == 'mc' ]]; then
+    tags=$(mc --insecure tag list "$MC_ALIAS"/"$2"/"$3" 2>&1) || result=$?
+  else
+    log 2 "invalid command type $1"
+    return 1
+  fi
+  if [[ $result -ne 0 ]]; then
+    if [[ "$tags" == *"NoSuchTagSet"* ]] || [[ "$tags" == *"No tags found"* ]]; then
+      tags=
+    else
+      log 2 "error getting object tags: $tags"
+      return 1
+    fi
+  else
+    log 5 "$tags"
+    tags=$(echo "$tags" | grep -v "InsecureRequestWarning")
+  fi
+  export tags
+}
\ No newline at end of file
diff --git a/tests/commands/head_object.sh b/tests/commands/head_object.sh
index fbb4068..d832b1d 100644
--- a/tests/commands/head_object.sh
+++ b/tests/commands/head_object.sh
@@ -2,28 +2,29 @@
 
 head_object() {
   if [ $# -ne 3 ]; then
-    echo "head-object missing command, bucket name, object name"
+    log 2 "head-object missing command, bucket name, object name"
     return 2
   fi
   local exit_code=0
-  local error=""
   if [[ $1 == 'aws' ]] || [[ $1 == 's3api' ]] || [[ $1 == 's3' ]]; then
-    error=$(aws --no-verify-ssl s3api head-object --bucket "$2" --key "$3" 2>&1) || exit_code="$?"
+    metadata=$(aws --no-verify-ssl s3api head-object --bucket "$2" --key "$3" 2>&1) || exit_code="$?"
   elif [[ $1 == 's3cmd' ]]; then
-    error=$(s3cmd "${S3CMD_OPTS[@]}" --no-check-certificate info s3://"$2/$3" 2>&1) || exit_code="$?"
+    metadata=$(s3cmd "${S3CMD_OPTS[@]}" --no-check-certificate info s3://"$2/$3" 2>&1) || exit_code="$?"
   elif [[ $1 == 'mc' ]]; then
-    error=$(mc --insecure stat "$MC_ALIAS/$2/$3" 2>&1) || exit_code=$?
+    metadata=$(mc --insecure stat "$MC_ALIAS/$2/$3" 2>&1) || exit_code=$?
   else
-    echo "invalid command type $1"
+    log 2 "invalid command type $1"
     return 2
   fi
   if [ $exit_code -ne 0 ]; then
-    if [[ "$error" == *"404"* ]] || [[ "$error" == *"does not exist"* ]]; then
+    if [[ "$metadata" == *"404"* ]] || [[ "$metadata" == *"does not exist"* ]]; then
+      log 5 "file doesn't exist ($metadata)"
       return 1
     else
-      echo "error checking if object exists: $error"
+      log 2 "error checking if object exists: $metadata"
       return 2
     fi
   fi
+  export metadata
   return 0
 }
\ No newline at end of file
diff --git a/tests/test_aws.sh b/tests/test_aws.sh
index 3274524..4afa1b8 100755
--- a/tests/test_aws.sh
+++ b/tests/test_aws.sh
@@ -18,6 +18,7 @@ source ./tests/commands/get_object_attributes.sh
 source ./tests/commands/get_object_legal_hold.sh
 source ./tests/commands/get_object_lock_configuration.sh
 source ./tests/commands/get_object_retention.sh
+source ./tests/commands/get_object_tagging.sh
 source ./tests/commands/list_object_versions.sh
 source ./tests/commands/put_bucket_acl.sh
 source ./tests/commands/put_bucket_policy.sh
@@ -85,7 +86,78 @@ source ./tests/commands/select_object_content.sh
   test_common_create_delete_bucket "aws"
 }
 
-# create-multipart-upload - test_complete_multipart_upload
+# create-multipart-upload
+@test "test_create_multipart_upload_properties" {
+  local bucket_file="bucket-file"
+  local bucket_file_data="test file\n"
+
+  local expected_content_type="application/zip"
+  local expected_meta_key="testKey"
+  local expected_meta_val="testValue"
+  local expected_hold_status="ON"
+  local expected_retention_mode="GOVERNANCE"
+  local expected_tag_key="TestTag"
+  local expected_tag_val="TestTagVal"
+  local five_seconds_later
+
+  os_name="$(uname)"
+  if [[ "$os_name" == "Darwin" ]]; then
+    now=$(date -u +"%Y-%m-%dT%H:%M:%S")
+    five_seconds_later=$(date -j -v +5S -f "%Y-%m-%dT%H:%M:%S" "$now" +"%Y-%m-%dT%H:%M:%S")
+  else
+    now=$(date +"%Y-%m-%dT%H:%M:%S")
+    five_seconds_later=$(date -d "$now 5 seconds" +"%Y-%m-%dT%H:%M:%S")
+  fi
+
+  create_test_files "$bucket_file" || fail "error creating test file"
+  printf "%s" "$bucket_file_data" > "$test_file_folder"/$bucket_file
+
+  delete_bucket_if_exists "s3api" "$BUCKET_ONE_NAME" || fail "error deleting bucket, or checking for existence"
+  create_bucket_object_lock_enabled "$BUCKET_ONE_NAME" || fail "error creating bucket"
+
+  log 5 "$five_seconds_later"
+  multipart_upload_with_params "$BUCKET_ONE_NAME" "$bucket_file" "$test_file_folder"/"$bucket_file" 4 \
+    "$expected_content_type" \
+    "{\"$expected_meta_key\": \"$expected_meta_val\"}" \
+    "$expected_hold_status" \
+    "$expected_retention_mode" \
+    "$five_seconds_later" \
+    "$expected_tag_key=$expected_tag_val" || fail "error performing multipart upload"
+
+  head_object "s3api" "$BUCKET_ONE_NAME" "$bucket_file" || fail "error getting metadata"
+  raw_metadata=$(echo "$metadata" | grep -v "InsecureRequestWarning")
+  log 5 "raw metadata: $raw_metadata"
+
+  content_type=$(echo "$raw_metadata" | jq -r ".ContentType")
+  [[ $content_type == "$expected_content_type" ]] || fail "content type mismatch ($content_type, $expected_content_type)"
+  meta_val=$(echo "$raw_metadata" | jq -r ".Metadata.$expected_meta_key")
+  [[ $meta_val == "$expected_meta_val" ]] || fail "metadata val mismatch ($meta_val, $expected_meta_val)"
+  hold_status=$(echo "$raw_metadata" | jq -r ".ObjectLockLegalHoldStatus")
+  [[ $hold_status == "$expected_hold_status" ]] || fail "hold status mismatch ($hold_status, $expected_hold_status)"
+  retention_mode=$(echo "$raw_metadata" | jq -r ".ObjectLockMode")
+  [[ $retention_mode == "$expected_retention_mode" ]] || fail "retention mode mismatch ($retention_mode, $expected_retention_mode)"
+  retain_until_date=$(echo "$raw_metadata" | jq -r ".ObjectLockRetainUntilDate")
+  [[ $retain_until_date == "$five_seconds_later"* ]] || fail "retention date mismatch ($retain_until_date, $five_seconds_later)"
+
+  get_object_tagging "aws" "$BUCKET_ONE_NAME" "$bucket_file" || fail "error getting tagging"
+  log 5 "tags: $tags"
+  tag_key=$(echo "$tags" | jq -r ".TagSet[0].Key")
+  [[ $tag_key == "$expected_tag_key" ]] || fail "tag mismatch ($tag_key, $expected_tag_key)"
+  tag_val=$(echo "$tags" | jq -r ".TagSet[0].Value")
+  [[ $tag_val == "$expected_tag_val" ]] || fail "tag mismatch ($tag_val, $expected_tag_val)"
+
+  put_object_legal_hold "$BUCKET_ONE_NAME" "$bucket_file" "OFF" || fail "error disabling legal hold"
+  head_object "s3api" "$BUCKET_ONE_NAME" "$bucket_file" || fail "error getting metadata"
+
+  get_object "s3api" "$BUCKET_ONE_NAME" "$bucket_file" "$test_file_folder/$bucket_file-copy" || fail "error getting object"
+  compare_files "$test_file_folder/$bucket_file" "$test_file_folder/$bucket_file-copy" || fail "files not equal"
+
+  sleep 2
+
+  delete_bucket_or_contents "aws" "$BUCKET_ONE_NAME"
+  delete_test_files $bucket_file
+}
+
 
 # delete-bucket - test_create_delete_bucket_aws
 
@@ -99,6 +171,35 @@ source ./tests/commands/select_object_content.sh
   test_common_set_get_delete_bucket_tags "aws"
 }
 
+#@test "test_get_object_invalid_range" {
+#  bucket_file="bucket_file"
+#
+#  create_test_files "$bucket_file" || local created=$?
+#  [[ $created -eq 0 ]] || fail "Error creating test files"
+#  setup_bucket "s3api" "$BUCKET_ONE_NAME" || local setup_result=$?
+#  [[ $setup_result -eq 0 ]] || fail "error setting up bucket"
+#  put_object "s3api" "$test_file_folder/$bucket_file" "$BUCKET_ONE_NAME" "$bucket_file" || fail "error putting object"
+#  get_object_with_range "$BUCKET_ONE_NAME" "$bucket_file" "bytes=0-0" "$test_file_folder/$bucket_file-range" || local get_result=$?
+#  [[ $get_result -ne 0 ]] || fail "Get object with zero range returned no error"
+#}
+
+#@test "test_get_object_full_range" {
+#  bucket_file="bucket_file"
+#
+#  create_test_files "$bucket_file" || local created=$?
+#  [[ $created -eq 0 ]] || fail "Error creating test files"
+#  echo -n "0123456789" > "$test_file_folder/$bucket_file"
+#  setup_bucket "s3api" "$BUCKET_ONE_NAME" || local setup_result=$?
+#  [[ $setup_result -eq 0 ]] || fail "error setting up bucket"
+#  put_object "s3api" "$test_file_folder/$bucket_file" "$BUCKET_ONE_NAME" "$bucket_file" || fail "error putting object"
+#  get_object_with_range "$BUCKET_ONE_NAME" "$bucket_file" "bytes=9-15" "$test_file_folder/$bucket_file-range" || fail "error getting range"
+#  cat "$test_file_folder/$bucket_file"
+#  cat "$test_file_folder/$bucket_file-range"
+#  ls -l "$test_file_folder/$bucket_file"
+#  ls -l "$test_file_folder/$bucket_file-range"
+#  compare_files "$test_file_folder/$bucket_file" "$test_file_folder/$bucket_file-range" || fail "files not equal"
+#}
+
 @test "test_put_object" {
   bucket_file="bucket_file"
 
diff --git a/tests/test_common.sh b/tests/test_common.sh
index 73dbeb5..9ae237b 100644
--- a/tests/test_common.sh
+++ b/tests/test_common.sh
@@ -10,6 +10,7 @@ source ./tests/commands/get_bucket_acl.sh
 source ./tests/commands/get_bucket_location.sh
 source ./tests/commands/get_bucket_tagging.sh
 source ./tests/commands/get_object.sh
+source ./tests/commands/get_object_tagging.sh
 source ./tests/commands/list_buckets.sh
 source ./tests/commands/put_bucket_acl.sh
 source ./tests/commands/put_object.sh
@@ -326,7 +327,7 @@ test_common_set_get_object_tags() {
   put_object "$1" "$test_file_folder"/"$bucket_file" "$BUCKET_ONE_NAME" "$bucket_file" || local copy_result=$?
   [[ $copy_result -eq 0 ]] || fail "Failed to add object to bucket '$BUCKET_ONE_NAME'"
 
-  get_object_tags "$1" "$BUCKET_ONE_NAME" $bucket_file || local get_result=$?
+  get_object_tagging "$1" "$BUCKET_ONE_NAME" $bucket_file || local get_result=$?
   [[ $get_result -eq 0 ]] || fail "Error getting object tags"
   if [[ $1 == 'aws' ]]; then
     tag_set=$(echo "$tags" | jq '.TagSet')
@@ -336,7 +337,7 @@ test_common_set_get_object_tags() {
   fi
 
   put_object_tag "$1" "$BUCKET_ONE_NAME" $bucket_file $key $value
-  get_object_tags "$1" "$BUCKET_ONE_NAME" "$bucket_file" || local get_result_two=$?
+  get_object_tagging "$1" "$BUCKET_ONE_NAME" "$bucket_file" || local get_result_two=$?
   [[ $get_result_two -eq 0 ]] || fail "Error getting object tags"
   if [[ $1 == 'aws' ]]; then
     tag_set_key=$(echo "$tags" | jq -r '.TagSet[0].Key')
diff --git a/tests/util.sh b/tests/util.sh
index 2325973..7dc3248 100644
--- a/tests/util.sh
+++ b/tests/util.sh
@@ -4,10 +4,13 @@ source ./tests/util_bucket_create.sh
 source ./tests/util_mc.sh
 source ./tests/logger.sh
 source ./tests/commands/abort_multipart_upload.sh
+source ./tests/commands/complete_multipart_upload.sh
+source ./tests/commands/create_multipart_upload.sh
 source ./tests/commands/create_bucket.sh
 source ./tests/commands/delete_bucket.sh
 source ./tests/commands/delete_object.sh
 source ./tests/commands/get_bucket_tagging.sh
+source ./tests/commands/get_object_tagging.sh
 source ./tests/commands/head_bucket.sh
 source ./tests/commands/head_object.sh
 source ./tests/commands/list_objects.sh
@@ -501,7 +504,7 @@ check_object_tags_empty() {
     echo "bucket tags empty check requires command type, bucket, and key"
     return 2
   fi
-  get_object_tags "$1" "$2" "$3" || get_result=$?
+  get_object_tagging "$1" "$2" "$3" || get_result=$?
   if [[ $get_result -ne 0 ]]; then
     echo "failed to get tags"
     return 2
@@ -571,7 +574,7 @@ get_and_verify_object_tags() {
     echo "get and verify object tags missing command type, bucket, key, tag key, tag value"
     return 1
   fi
-  get_object_tags "$1" "$2" "$3" || get_result=$?
+  get_object_tagging "$1" "$2" "$3" || get_result=$?
   if [[ $get_result -ne 0 ]]; then
     echo "failed to get tags"
     return 1
@@ -595,37 +598,6 @@ get_and_verify_object_tags() {
   return 0
 }
 
-# get object tags
-# params:  bucket
-# export 'tags' on success, return 1 for error
-get_object_tags() {
-  if [ $# -ne 3 ]; then
-    echo "get object tag command missing command type, bucket, and/or key"
-    return 1
-  fi
-  local result
-  if [[ $1 == 'aws' ]]; then
-    tags=$(aws --no-verify-ssl s3api get-object-tagging --bucket "$2" --key "$3" 2>&1) || result=$?
-  elif [[ $1 == 'mc' ]]; then
-    tags=$(mc --insecure tag list "$MC_ALIAS"/"$2"/"$3" 2>&1) || result=$?
-  else
-    echo "invalid command type $1"
-    return 1
-  fi
-  if [[ $result -ne 0 ]]; then
-    if [[ "$tags" == *"NoSuchTagSet"* ]] || [[ "$tags" == *"No tags found"* ]]; then
-      tags=
-    else
-      echo "error getting object tags: $tags"
-      return 1
-    fi
-  else
-    log 5 "$tags"
-    tags=$(echo "$tags" | grep -v "InsecureRequestWarning")
-  fi
-  export tags
-}
-
 # list objects in bucket, v1
 # param:  bucket
 # export objects on success, return 1 for failure
@@ -662,27 +634,6 @@ list_objects_s3api_v2() {
   export objects
 }
 
-# initialize a multipart upload
-# params:  bucket, key
-# return 0 for success, 1 for failure
-create_multipart_upload() {
-  if [ $# -ne 2 ]; then
-    echo "create multipart upload function must have bucket, key"
-    return 1
-  fi
-
-  local multipart_data
-  multipart_data=$(aws --no-verify-ssl s3api create-multipart-upload --bucket "$1" --key "$2") || local created=$?
-  if [[ $created -ne 0 ]]; then
-    echo "Error creating multipart upload: $upload_id"
-    return 1
-  fi
-
-  upload_id=$(echo "$multipart_data" | jq '.UploadId')
-  upload_id="${upload_id//\"/}"
-  export upload_id
-}
-
 # upload a single part of a multipart upload
 # params: bucket, key, upload ID, original (unsplit) file name, part number
 # return: 0 for success, 1 for failure
@@ -706,24 +657,25 @@ upload_part() {
 # return:  0 for success, 1 for failure
 multipart_upload_before_completion() {
   if [ $# -ne 4 ]; then
-    echo "multipart upload pre-completion command missing bucket, key, file, and/or part count"
+    log 2 "multipart upload pre-completion command missing bucket, key, file, and/or part count"
     return 1
   fi
 
   split_file "$3" "$4" || split_result=$?
   if [[ $split_result -ne 0 ]]; then
-    echo "error splitting file"
+    log 2 "error splitting file"
     return 1
   fi
 
   create_multipart_upload "$1" "$2" || create_result=$?
   if [[ $create_result -ne 0 ]]; then
-    echo "error creating multpart upload"
+    log 2 "error creating multpart upload"
     return 1
   fi
 
   parts="["
   for ((i = 1; i <= $4; i++)); do
+    # shellcheck disable=SC2154
     upload_part "$1" "$2" "$upload_id" "$3" "$i" || local upload_result=$?
     if [[ $upload_result -ne 0 ]]; then
       echo "error uploading part $i"
@@ -739,24 +691,140 @@ multipart_upload_before_completion() {
   export parts
 }
 
+multipart_upload_before_completion_with_params() {
+  if [ $# -ne 10 ]; then
+    log 2 "multipart upload command missing bucket, key, file, part count, content type, metadata, hold status, lock mode, retain until date, tagging"
+    return 1
+  fi
+
+  split_file "$3" "$4" || split_result=$?
+  if [[ $split_result -ne 0 ]]; then
+    log 2 "error splitting file"
+    return 1
+  fi
+
+  create_multipart_upload_params "$1" "$2" "$5" "$6" "$7" "$8" "$9" "${10}" || local create_result=$?
+  if [[ $create_result -ne 0 ]]; then
+    log 2 "error creating multpart upload"
+    return 1
+  fi
+
+  parts="["
+  for ((i = 1; i <= $4; i++)); do
+    upload_part "$1" "$2" "$upload_id" "$3" "$i" || local upload_result=$?
+    if [[ $upload_result -ne 0 ]]; then
+      log 2 "error uploading part $i"
+      return 1
+    fi
+    parts+="{\"ETag\": $etag, \"PartNumber\": $i}"
+    if [[ $i -ne $4 ]]; then
+      parts+=","
+    fi
+  done
+  parts+="]"
+
+  export parts
+}
+
+multipart_upload_before_completion_custom() {
+  if [ $# -lt 4 ]; then
+    log 2 "multipart upload custom command missing bucket, key, file, part count, and/or optional params"
+    return 1
+  fi
+
+  split_file "$3" "$4" || local split_result=$?
+  if [[ $split_result -ne 0 ]]; then
+    log 2 "error splitting file"
+    return 1
+  fi
+
+  # shellcheck disable=SC2048
+  create_multipart_upload_custom "$1" "$2" ${*:5} || local create_result=$?
+  if [[ $create_result -ne 0 ]]; then
+    log 2 "error creating multipart upload"
+    return 1
+  fi
+  log 5 "upload ID: $upload_id"
+
+  parts="["
+  for ((i = 1; i <= $4; i++)); do
+    upload_part "$1" "$2" "$upload_id" "$3" "$i" || local upload_result=$?
+    if [[ $upload_result -ne 0 ]]; then
+      log 2 "error uploading part $i"
+      return 1
+    fi
+    parts+="{\"ETag\": $etag, \"PartNumber\": $i}"
+    if [[ $i -ne $4 ]]; then
+      parts+=","
+    fi
+  done
+  parts+="]"
+
+  export parts
+}
+
+multipart_upload_custom() {
+  if [ $# -lt 4 ]; then
+    log 2 "multipart upload custom command missing bucket, key, file, part count, and/or optional additional params"
+    return 1
+  fi
+
+  # shellcheck disable=SC2048
+  multipart_upload_before_completion_custom "$1" "$2" "$3" "$4" ${*:5} || local result=$?
+  if [[ $result -ne 0 ]]; then
+    log 2 "error performing pre-completion multipart upload"
+    return 1
+  fi
+
+  log 5 "upload ID: $upload_id, parts: $parts"
+  complete_multipart_upload "$1" "$2" "$upload_id" "$parts" || local completed=$?
+  if [[ $completed -ne 0 ]]; then
+    log 2 "Error completing upload"
+    return 1
+  fi
+  return 0
+}
+
+multipart_upload() {
+  if [ $# -ne 4 ]; then
+    log 2 "multipart upload command missing bucket, key, file, and/or part count"
+    return 1
+  fi
+
+  multipart_upload_before_completion "$1" "$2" "$3" "$4" || local result=$?
+  if [[ $result -ne 0 ]]; then
+    log 2 "error performing pre-completion multipart upload"
+    return 1
+  fi
+
+  complete_multipart_upload "$1" "$2" "$upload_id" "$parts" || local completed=$?
+  if [[ $completed -ne 0 ]]; then
+    log 2 "Error completing upload"
+    return 1
+  fi
+  return 0
+}
+
 # perform a multi-part upload
 # params:  bucket, key, source file location, number of parts
 # return 0 for success, 1 for failure
-multipart_upload() {
-  if [ $# -ne 4 ]; then
-    echo "multipart upload command missing bucket, key, file, and/or part count"
+multipart_upload_with_params() {
+  if [ $# -ne 10 ]; then
+    log 2 "multipart upload command requires bucket, key, file, part count, content type, metadata, hold status, lock mode, retain until date, tagging"
     return 1
   fi
+  log 5 "1: $1, 2: $2, 3: $3, 4: $4, 5: $5, 6: $6, 7: $7, 8: $8, 9: $9, 10: ${10}"
 
-  multipart_upload_before_completion "$1" "$2" "$3" "$4" || result=$?
+  multipart_upload_before_completion_with_params "$1" "$2" "$3" "$4" "$5" "$6" "$7" "$8" "$9" "${10}" || result=$?
   if [[ $result -ne 0 ]]; then
-    echo "error performing pre-completion multipart upload"
+    log 2 "error performing pre-completion multipart upload"
     return 1
   fi
+  log 5 "Upload parts:  $parts"
 
-  error=$(aws --no-verify-ssl s3api complete-multipart-upload --bucket "$1" --key "$2" --upload-id "$upload_id" --multipart-upload '{"Parts": '"$parts"'}') || local completed=$?
+  complete_multipart_upload "$1" "$2" "$upload_id" "$parts" || local completed=$?
   if [[ $completed -ne 0 ]]; then
-    echo "Error completing upload: $error"
+    log 2 "Error completing upload"
     return 1
   fi
   return 0