You are using the wrong .caf file format.
To create a .caf file, use iTunes.
iTunes → settings → Import settings → import using: select the AIFF encoder, create user settings, if you want click “OK”, again “OK”
then select the music from your library and press: advanced → create an AIFF version drag and drop the new generated file to the desktop and change the extension from .aif to .caf
that you have a .caf file that will work on your iPhone
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