I use the free version of Dropbox installed on three computers, two laptops with Windows 10 O/Ss and the third an iPad. I generally use one specific laptop (call it Dell) to make any necessary alterations to my Dropbox files and I rely on the Sync feature to update Dropbox on the other two machines However, a couple of weeks ago I did a reset on Dell which replaced the Windows 10 O/S in order to speed up the machine. I later restored Dropbox on the reset Dell. I now find that, when I alter my Dropbox files on Dell, the other two machines are not picking up the file alterations, i.e not syncing.
I suspect the problem is because Dropbox thinks I have put it on a 4th computer which I understand one is not allowed to do with Dropbox free version. Could someone kindly tell me how to put things straight with Dropbox to restore syncing on my three machines. I guess it means somehow removing reference to Dell before it was reset but I do not want to do something that would put my files back to the pre-restore date. Thanks.