So you see I'm tryna to upload an mp3 file manually by the user. Like when btn_upload.click then open a prompt or something, to upload a mp3 file. Thank you.

Use the FileList method from the file extension to get a list of the mp3 files [image] App Inventor Extensions: File | Pura Vida Apps App Inventor snippets, tutorials, links and App Inventor extensions directory. Then use the listpicker to pick a file to play…