Is there any way to export the midi from music studio? I don’t love the sound files of the app and there’s no true velocity editing that I know of, so I want to be able to write my songs on the app and then send it over to my computer DAW

Yes, simply go to the Projects screen and save your project. Then select it, tap Export and select MIDI.
See https://www.xewton.com/musicstudio/doc/?id=9#Export