Copy & Paste from iPhone to Mac doesn't work (Universal Clipboard)
If the copy feature was working in the past and all of a sudden it stopped working, then you could try either of the following options:


Restart Bluetooth (Turn off &amp; on) on both the devices (iPhone &amp; Mac) - System Preferences --> Bluetooth --> Turn Bluetooth Off
Sign Out and Sign In back to iCloud on both the devices (iPhone &amp; Mac)


If neither works, you can restart both the devices and it should start working.