Hello, how can I get an invitation to upload a 3d model. Also, what format should the 3d model upload be in? How can I get technical details.
I'm sorry to disappoint you, but there are only selected artists that get invited for the moment and the technical details are not public. When that part of contribution gets opened for general submissions, Adobe will publish the requirements on their website.
For now, you have only the choice to submit 3D to competing stock sites.