i purchesd a 3d file from adobe stock i can open in photoshop and dimension but the plan was to use it for engraving work. the shop i am dealing with wasnt able to download it and asked for a vector base file. but the folder sent by adobe contain only .mtl .obj and .Png
whats the trick here ?
I moved your post over from the poorly named "Using the Community" forum, which is for getting help using this forum system, to a better forum.
I hope this helps. Best of luck to you.
Your question may get a better answer from the Phothoshop: https://community.adobe.com/t5/photoshop/bd-p/photoshop?page=1&sort=latest_replies&filter=all or Dimension: https://community.adobe.com/t5/dimension/bd-p/dimension?page=1&sort=latest_replies&filter=all communities as they would be familiar with the manipulation of this file type.
I think it's fair to say you obtained the wrong kind of file for this project. Always start with the specifications and go from there. An example of a vector graphic file would be math-based SVG, AI or EPS for Illustrator.
Your engraver needs high quality vector so that it can be rescaled up or down without any loss in quality. That's not possible with pixel-based, raster images like JPG or PNG.