Long sound files don't work

MIT App Inventor Help
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2

Try this to upload a file > 5 MB (mp3, ogg, ...) to the assets:

The max aia size is 10 MB in AI2.

See also here:

Ayuda, me dice que error con el servidor y no deja hacer al APK , que hago? [Help, it tells me there is an error with the server and it doesn't let the APK do what I do?]