Hi! I found a fix for this issue incase someone runs into it in the future.
The error at the end of the file location “uasset has newer custom version of FortniteMain” showed up because unreal engine (in this case i was using unreal engine 5 too), was trying to find files that didn’t exist inside the editor content browser, or didn’t show up there, but the files showed up/exists when you look in the same folder through the project folder through windows. Deleting these “ghost” files managed to get rid of the errors from me.
I think this error happened/or this unsuccessful loading of the assets happened because I upgraded the project (hence the newer custom version of), or it happened because I tried to migrate files from a project where its version wasn’t compatible with unreal engine 5 (At this time, I believe 4.27 to 5.0 transfers don’t work, but 4.26 to 5.0 works).
Hope this helps! 