I have a ubuntu 22.04.3 LTS desktop. It has a SSD on which OS is installed and a HD for other non-OS things. By default Dropbox store local data in Home dir of ubuntu. I was running out of storage, so i moved it to my HD (using Move option in preferences). It worked well, but as soon as I restart my system, Dropbox always notify me of directory has change (which i did intentioanlly) and ask me exit or relink which ultimately set everything back to Home fodler.