diff --git a/js/taglib.ts b/js/taglib.ts
index d4dbad8..f7ee443 100644
--- a/js/taglib.ts
+++ b/js/taglib.ts
@@ -2,12 +2,9 @@ import { TagLib } from 'taglib-wasm';
 import { fetchBlobURL } from './utils';
 import _TagLibWasm from '!/taglib-wasm/dist/taglib-web.wasm?url';
 import type {
-    TagLibWorkerMessageType,
     AddMetadataMessage,
-    GetMetadataMessage,
     TagLibFileResponse,
     TagLibMetadataResponse,
-    TagLibMetadata,
     TagLibReadMetadata,
 } from './taglib.types';
 import TagLibWorker from './taglib.worker?worker';
@@ -62,7 +59,7 @@ export async function getMetadataWithTagLib(audioData: Uint8Array) {
         audioData = new Uint8Array(audioData);
     }
 
-    const worker = new Worker(new URL(TagLibWorker, import.meta.url), { type: 'module' });
+    const worker = new TagLibWorker();
     const wasmUrl = await fetchTagLib();
 
     return new Promise<TagLibReadMetadata>((resolve, reject) => {
diff --git a/js/taglib.worker.ts b/js/taglib.worker.ts
index 44ec706..e7841a5 100644
--- a/js/taglib.worker.ts
+++ b/js/taglib.worker.ts
@@ -261,9 +261,14 @@ self.onmessage = async (event: MessageEvent<TagLibWorkerMessage>) => {
 
     switch (event.data.type) {
         case 'Add':
+            if ((event.data as AddMetadataMessage).cover?.data?.buffer instanceof ArrayBuffer) {
+                transfer.push((event.data as AddMetadataMessage).cover.data.buffer);
+            }
+
             try {
                 const result = await addMetadataToAudio(event.data as AddMetadataMessage);
                 transfer.push(result.buffer);
+
                 self.postMessage(
                     {
                         type: event.data.type,