I found that I had a modpack I was trying and trying to get uploaded, but the pack was rejecting time and time again for various reasons. Now that the pack no longer has all these faults that made it rejected, it stays ''under review'' for infinity.
And when I upload the same ZIP modpack file but hide it under a different name, it gets looked at immediately. Which means the moderators definitly do get tired of some people's submissions, which is a real shame. I expected better
Note: Sync and your Project CurseForge REQUIRE a project to have one file marked Released on them for the projects to show up in search. Otherwise only Direct links to the project work.
Files can take a while to show up in the app. If your files still have not shown up either your project is new and you have yet to mark a file as Release or there is issues with the sync system making it slow.