one of my bigger projects won't upload for "Unknown Reason" but the other ones do. is this fixable?
It's probably too large to upload. 10 MB is the limit, so try taking out minor sounds or costumes, and delete list items of there are any.
the project is only 4.9 MB and i've tried uploading it to another account and it still didn't work and i can't seem to find any bugs in the project itself
Some project are harder to upload than others (the bigger the project, the more likely you'll encounter a site hiccup and get uploading errors). Keep trying, it should eventually go through.