diff --git a/weed/s3api/s3api_streaming_copy.go b/weed/s3api/s3api_streaming_copy.go
index 300b1886a..1759e8f91 100644
--- a/weed/s3api/s3api_streaming_copy.go
+++ b/weed/s3api/s3api_streaming_copy.go
@@ -459,8 +459,8 @@ func (scm *StreamingCopyManager) streamToChunks(ctx context.Context, reader io.R
 	for {
 		n, err := reader.Read(buffer)
 		if n > 0 {
-			// Create chunk for this data, passing encryption spec for SSE type
-			chunk, chunkErr := scm.createChunkFromData(buffer[:n], offset, dstPath, spec.EncryptionSpec)
+		// Create chunk for this data, setting SSE type and per-chunk metadata (including chunk-specific IVs for SSE-S3)
+		chunk, chunkErr := scm.createChunkFromData(buffer[:n], offset, dstPath, spec.EncryptionSpec)
 			if chunkErr != nil {
 				return nil, fmt.Errorf("create chunk from data: %w", chunkErr)
 			}