In the process, completely unbeknownst to me, Qbittorrent lost all progress on existing download.

I would like to relist all of my files, primarily for upload actually (I have a lot of files and I want to continue to share them with the community).
Is there a way to get Qbittorrent to recognize the files and re-upload them?
I know there is a rather long and convoluted way, as I mistakenly attempted to re-download a file I already had and it resulted in finding that file in the download folder and checking it. I mean I could do it that way but that's a lot of files.
Any help greatly appreciated!!!!