fix: set default spec to form

src/utils/load-audio-file.ts

@@ -1,5 +1,14 @@
 import { convertFileSize } from './index';
 
+export const convertFileToBase64 = (file: File): Promise<string> => {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.readAsDataURL(file);
+    reader.onload = () => resolve(reader.result as string);
+    reader.onerror = (error) => reject(error);
+  });
+};
+
 export const loadAudioData = async (data: any, type: string) => {
   return new Promise((resolve, reject) => {
     try {