Move or Copy Shared Files/Folders to "My Files" without Download and Upload.
In Drive Web or Desktop App, Files and Folders which have been shared to one Person (Shared with me Tab), should be able to be copied or moved to "My Files" Tab without the neccessity to download and reupload to/from a local Computer.

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Jalal commented
This is critical for my use case also. The ability to have a folder that is "shared with me" organised into my own drive is the only way to effectively collaborate on a directory with others
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Juan commented
This is a absolutely critical to make Proton Drive to a usable product for a family or a business.
If we can't collaborate on a folder (i.e, I add a file in my local folder, gets synced/uploaded to the cloud, the other person gets the file downloaded to the folder we share in his local computer) then Proton Drive is just good for personal backup.
I can't imagine any online business moving to Proton Drive without this.