DSF

I've been using a few mockup images recently which have been great. I've just downloaded one but it appears to be a 3D object rather than a straight forward mockup.

It looks great, change the item colour, angle etc. but I'm not sure if I can insert an image as per usual mockups.

Not knowing anything about Photoshop 3D work i['m struggling with the materials etc. I wonder if anyone can shed some light and help me out here please?

Here are a few tutorials to help:
Using displace to map an image over a surface video
Wrapping a 2d image around a cylinder Video
Using the transform tool to map an image onto a 3d object Tutorial (click the clear button when the page loads to view the tutorial)
Using the warp tool to overlay an image tutorial

I have a tutorial I got with the files but can't see where to load in the materials, looks different on my screen even though same version

I'll take a look at those tutorials thank you.