How can I transfer audio files into music programs?

I recorded audios on my phone and sent them by e-mail to my laptop, where they are now stored as a mp4 file. But if I want to bring them to the Magic Music Maker program now, the following will be displayed:

Please make sure the affected drive is not full or read-only. If you do not have permission to read and write in this path, please contact the administrator.

I have Windows 10 on an acer laptop and the audios have been captured on an Android device. How can I apply it in Magic Muisc Maker?

Can you play it normally?

Maybe with Audacity or ffmpeg convert to .wav.

Yes, I can play it on the Windows Media Player.

Then your program probably does not like the files.

Then follow my second advice (converting to .wav and importing them)

I'm really bad about technology. How do I do that exactly?

Install XMedia Recode. With that you can easily change into all sorts of formats.

Load the file in Audacity and then export directly as wav file again.