>>324382846
you can switch the solid dispilay mode to 'texture' or 'material', or use eevee rendering mode. won't be exactly the same as in unity/vrchat but you can get pretty close if you work on it. I just use flat lit though.

For editing in PS or whatever, I don't think you can get it realtime, but you can refresh the image in the texture manually. Somebody's probably writtena plugin to do it automatically on change maybe