DropBox can only be connected with 3 devices from now
DropBox is free but you can only connect it to 3 devices from now. This applies to all new Dropbox users. Old users who have connected more than 3 devices before March 2019 will remain the same. But you can't connect additional devices any more. If you think this is some sort of limitation on the regular user you can go for DropBox alternatives.
1. https://www.pcloud.com/dropbox-lp/ - Free 10GB
2. https://www.google.com/drive/ - Free 15GB
3. https://www.box.com/en-gb/home - Free 10GB
4. https://onedrive.live.com/ - Free 5GB
5. https://www.mediafire.com/ - Free 10GB