I have imported decals as PNG and tried to add them by using alt and dragging, a new layer is made but nothing shows up on the model.
can anyone please give some insight into why this is not working?
Could you share more information about your issue? Some screenshots or even a video of your problem would help me understand your problem.
Do you see a message asking what channel you want to use the PNG decal on ?
Yes, and i have clicked on Base color but this gives me the result you see in the screenshots.