Hello Developers! It will not let me insert my mesh into studio??? 
It says in output that the file has an inappropriate name, but the ones it was letting me insert before, are now meeting to the same error. And when I could insert the meshes, the faces I was facing in studio, were invisible. I don’t have any proof of this, because not it’s not letting me insert it at all. Any help 
You could possibly record the problem, and reinstall studio.
I’m not sure that would be anything to do with the problem.
The invisible faces may be an issue with where your normals are facing. If you are using blender to make your meshes you can see which parts will not be visible in game engines by enabling face orientations in viewport overlays, if you see red that means it won’t be visible.
I have some pictures on a different post where I think someone had a similar problem to you here: I need help with 3D modeling/UGC? - #2 by twistedpink
For the file names, roblox moderation can be picky and a pain sometimes lol, I would just rename your files and hope for the best
Hello! I always now try to insert the mesh into a baseplate and then copy it over. It should work on any roblox studio place, but ROBLOX needs to fix this. I am not able yet to post bug reports…