I have an iPhone connected in the cubby hole, this plays music but doesn't charge.

My preferred phone is Android so can't connect that there.

I tried copying my whole iTunes library via a converter to MP3 to a flash drive but that gives me an error whenever I plug it in.

My preferred method is to only use my Android phone but worst case scenario I would use the phone for calls and the flash drive for music.

Is there anything on the market that can help me? Any ideas why the flash drive/MP3 combination isn't working?

If your flashdrive is bigger than 32GB it won't read it. I use a couple of old 160GB iPod classics as they are capable of holding 20K of songs each, and put the iPod shortcut on to the home menu for access works for me personally.

Cheers
Col