Along with the advent of firmware 8.5 came the ability to configure clipboard redirect in HTML5 RDP bookmarks.
The clipboard redirect can be configured in the bookmark settings:
After accessing bookmark and trying to copy text on the remote server an icon will blink below the S shield:
Click the blinking icon, and a dialog pops up with the copied text in the input field. You can copy the text
manually from there and paste it to the local machine.
In the other direction, it works just like copying/pasting locally. Simply copy the local string and
paste it on remote machine.