Dropbox stopped syncing on Win11, but the app says there aren't any sync issues.

One more update, a happy one! I think that my syncing issue has been resolved. I've found some thread in Reddit that talks about offending files. According to one person, after these files are removed Dropbox will go ahead and sync. The problem is that it takes some detective work to find the offending file(s), since the files Dropbox is continually updating may not be the offending files, as it turns out. 

I tried to follow the instructions in the thread about how to indentify such files in Task Manager but didn't succeed with it. Then I've decided to look through some folders on my PC that I modified recently, and found one folder with hundreds of files which was indicated with a red instead of the usual green circle, and indeed this entire folder did not have Dropbox in the drop-down list when right-clicking on it. I bulk downloaded from the internet the hundreds of files in this folder about 10 days ago, so I deleted all of them and repeated the bulk download. I was asked repeatedly if I trust the source, since these files could be harmful to my computer - this may have something to do with the Dropbox syncing issue, I'm not sure. Anyhow, for now this folder with tons of files (and sub-folders) has a green circle, Dropbox appears in the drop-down list when I right-click on it or on any file or folder within it, and my desktop app says "up to date" instead of trying to download some file(s) perpetually. 

So, for now my issue has been resolved. I hope that this might be helpful for others with similar syncing issues.