Put MP3 in iCloud/Shortcuts/ folder
How can I add a mp3 file to iCloud/Shortcuts/ folder?
what audio file type can be added to iCloud/Shortcuts/ folder?
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You can sign in here: https://www.icloud.com
Select iCloud Drive. There you can create folders and drag and drop Mp3 files from your PC.
If you use a Mac, then you can use iCloud Drive in Finder.
All file types can basically be added. However, not all file formats can be played directly in the Files app.
Mp3 files can be played without any problems in the Files app.