diff --git a/packages/frontend/src/composables/use-uploader.ts b/packages/frontend/src/composables/use-uploader.ts
index e614abf94f..cecc23fe40 100644
--- a/packages/frontend/src/composables/use-uploader.ts
+++ b/packages/frontend/src/composables/use-uploader.ts
@@ -653,6 +653,7 @@ export function useUploader(options: {
 
 			preprocessedFile = new Blob([output.target.buffer!], { type: output.format.mimeType });
 			item.compressedSize = output.target.buffer!.byteLength;
+			item.uploadName = `${item.name}.mp4`;
 		} else {
 			item.compressedSize = null;
 			item.uploadName = item.name;