I had to disconnect a drive and Box sync broke and has been a massive pain to get working again. When the drive was reconnected, Box couldn't reuse the old folder, and once it started a new folder, I didn't appear to have the option to change it.

I uninstalled and reinstalled Box sync so I could point it at the original directory it used with all the files still in place. It did not recognize any of the files. Instead, it renamed all the folders, downloaded duplicates of everything, and then ran out of space on my cloud storage because it synced all the duplicates back.

Now it's apparent I should just not have attempted to fix it and defaulted redownloading everything from the start, but that shouldn't have to be the case. I imagine this would be a much bigger issue for anyone using more than the 10 GB from a free account.