Alright, so regarding a File Dimension issue, where it is set to inf, I searched around the DevForum, and found 2 posts you can follow:
Post 1 w. Solution
I found this comment that shows how to generally fix it.
If his comment did not work you check the Asset Manager,
Then see if you can spot a problem with your mesh such as the following, does it say there is something wrong with your mesh itself?
This is all from this post that I saw before: (I suggest you check it out, as they had the exact same issue as yours)
Post 2 w. Solution
If it still didn’t work in your case, then try this step: (It worked in another post)
Then this person responded to the comment above saying you don’t have to delete the mesh with 0 verts.
And if none of the above worked you can try this:
This was the original post of what I got:
Anyway, let me know if you are still facing any issues, or if you found a solution to your problem.