Copy/paste of CF_HTML formatted content not working

Hello,

I did post this issue in a reply in another thread, but though best to create a new post for this issue.

I have a RemoteApp that uses CF_HTML formatted content and the only way this content can be copy/pasted from the app to the local user's computer is if drive redirection is disabled.

This issue affects Windows 7 machines but does work on Windows 10. So seems to point to a bug/limitation in the older RDP protocol.

RDS farm is Windows Server 2016.

Only info I can find online is: https://www.spicelogic.com/docs/WinHTMLEditorControl/KnownIssues/150

and this which only relates to Citrix: https://support.citrix.com/article/CTX221798

Is anyone able to shed any light on this issue and if there is any solution (other than just disabling drive redirection, which is far from ideal)?

Thanks,