The project folder is located in C:\UE4; In this case, C:\UE4\ReimportTest2 contains the project file, Content folder, etc. I am using the import button on the content browser rather than dragging the file in. After import, when I open the asset to examine its properties, its Source File Path starts with “…/…/…/…/…/…/,” which is too many to reach C:\ from C:\UE4\ReimportTest2. But it would be just enough if it were in the default Unreal Projects directory. This has been confirmed to be the problem in [the post I linked][1] from last year and [related issues][2]. And, you can always ask other staff that [have been able to reproduce this][3].
I do not have another machine on which to test this, but others with the same problem might.