my new Samsung Galaxy A03s when connect by USB cant see any files with Thunar on the phone. My last two LG phones could. I have the Type-C to Type-C with adapter cable that came with Samsung connected.
I solved it myself by just pressing the power button and entering my PIN. on the screen I had to to press yes or something to used connected to computer.
I’ll do this later or tomorrow and give exact detail.
Each time you plug in the phone to computer, press the power button and press allow and then open file manager on computer. Every thing is to go.