diff --git a/seaweed-volume/src/server/grpc_server.rs b/seaweed-volume/src/server/grpc_server.rs
index a46971bec..6b97ac4fe 100644
--- a/seaweed-volume/src/server/grpc_server.rs
+++ b/seaweed-volume/src/server/grpc_server.rs
@@ -3335,9 +3335,15 @@ impl VolumeServer for VolumeGrpcService {
                             )));
                         }
 
-                        // Close local dat file handle (matches Go's v.LoadRemoteFile
-                        // which closes DataBackend before switching to remote)
-                        vol.close_local_dat_backend();
+                        // Switch the data backend from the local .dat to the remote
+                        // object so reads keep working after upload (matches Go's
+                        // LoadRemoteFile).
+                        if let Err(e) = vol.load_remote_dat_file() {
+                            return Err(Status::internal(format!(
+                                "volume {} failed to load remote file: {}",
+                                vid, e
+                            )));
+                        }
 
                         // Optionally remove local .dat file from disk
                         if !keep_local {
diff --git a/seaweed-volume/src/storage/volume.rs b/seaweed-volume/src/storage/volume.rs
index a83c652e5..9fa355f30 100644
--- a/seaweed-volume/src/storage/volume.rs
+++ b/seaweed-volume/src/storage/volume.rs
@@ -949,7 +949,7 @@ impl Volume {
         Ok(())
     }
 
-    fn load_remote_dat_file(&mut self) -> Result<(), VolumeError> {
+    pub(crate) fn load_remote_dat_file(&mut self) -> Result<(), VolumeError> {
         let (storage_name, storage_key) = self.remote_storage_name_key();
         let backend = crate::remote_storage::s3_tier::global_s3_tier_registry()
             .read()
@@ -2225,12 +2225,6 @@ impl Volume {
         }
     }
 
-    /// Close the local .dat file handle (matches Go's v.DataBackend.Close() in LoadRemoteFile).
-    /// Called after tier-upload when the local file is being replaced by remote storage.
-    pub fn close_local_dat_backend(&mut self) {
-        self.dat_file = None;
-    }
-
     /// Close the remote dat file backend (matches Go's v.DataBackend.Close(); v.DataBackend = nil).
     /// Called after tier-download when the remote backend is being replaced by local storage.
     pub fn close_remote_dat_backend(&mut self) {