I haven't used the 3D feature too much with Photoshop. I have an .obj file that I'm supposed to apply texture (a beer label for a mock-up for a project) and currently, my .obj file loads blank. All the texture and colours do not appear, and when I adjust the texture layers to add the label, the main .obj file remains unchanged.
I have used this same file in the past, for the last 4 or 5 months to do the same thing over and over - I would open the "standard base colour" layer, add my label file and adjust it to fit; save the "standard base colour" layer and then the changes would appear to the .obj model.
Only now, any changes I make to the texture layer have no effect on the main .obj file. I have a current edition of Photoshop and no pending updates, so I don't know what has changed. My methods have been the same to change the labels in the past, but now, the file doesn't load properly.
I'm not the most savvy when it comes to this area of Photoshop, so I will do my best to further explain as needed.