I have a flash drive that fits in my phone and I can view it in file manager. Is there a way to make it visible from my gallery?
Also does the fact that it works mean if I got a endoscope camera it would work?
I doubt the stock Gallery can display the images. Try some 3rd party gallery apps.
What are you asking about the endoscope? Do you want to connect the endoscope to the phone via USB and see if it will actually display the real-time images?