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That’s not surprising at all. I think the most common use case is that someone who plugs in their iPhone will be playing music from their iPhone rather than from another connected USB media source. Building a system that supports both connected devices intelligently and simultaneously is probably complicated so they didn’t do that since it’s uncommon.
Two ideas:
1) Have you considered loading the music files on your phone instead and playing music through Apple CarPlay?
2) As a workaround, if the only thing you want to do is charge your iPhone, you can get a power-only USB cable. CarPlay won’t work, but you don’t want CarPlay, right? You just want to charge your phone.
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