trouble copying and pasting content between devices

I have the same problem.

While universal clipboard and other continuity features are notoriously unreliable for some users, there are a few tricks that can cause it to work as expected.

One is to turn off Bluetooth and Wi-Fi, sign out of your Apple ID, restart your device, and reenable Bluetooth and Wi-Fi and sign back in.

Another more drastic step is to reset your network settings. To do this, open Settings > general > reset > reset network settings. This will erase remembered Wi-Fi networks, so you'll need to reenter their passwords the next time you connect to them.

If you are using a network managed by a company or educational institution, there may be security provisions on that network that prevent continuity features from working properly. Talk to your network administrator to determine if this is the case.

HTH