I take pics on (in my case, mirrorless) proper camera, upload to PC as normal, edit and crop as desired, connect phone to PC with USB cable, transfer pics to relvant folder in phone, and post from there. I edit in Capture One, and I normally export edited jpgs to a holding folder, and then transfer from there, but there's no reason why I can't connect the phone and then export directly to it, I think. The untainted RAW files obviously stay on the PC, as they indeed should.