Just a heads up. Dropbox (apparently silently) changed their policy around connected devices for free accounts in March. From now on free accounts have a three device limit. If you currently have more than three devices in your device list, you'll be fine until you try to replace or add a device. As soon as you try to add or replace a device, you'll have to delete pretty much every device in your list except two, then you'll be able to add the third. You'll find the device list under Settings/Security/Devices.

What do I do if my device limit is reached?
If you're a Basic user and you linked more than three devices prior to March 2019, all of your previously linked devices remain linked.

 

However, if you'd like to link a new device (or re-link a previously linked device), you must unlink all currently linked devices (down to less than three), and then you can link your new devices (up to three).