Hi,
1.What is the version of RDC you are running? For the version released on August, it mentioned to fix issues with copying files.
2.In general, copy paste files between local and remote PC can be done by following steps.
- Right click the file you want to transfer
- Choose Copy from the menu
- Right click the folder (or desktop) you want to transfer to
- Choose Paste
For your findings and feedback, you could post via the remoteapp feedback hub or in below user voice forum, where the product team will regularly visit.
https://remotedesktop.uservoice.com/forums/266795-remote-desktop-services
Hope this helps and please help to accept as Answer if the response is useful.
Thanks,
Jenny