Existing OneDrive Document Versus Make a Copy
I would love to see the ability to add an existing one drive document in the area of FILES in Teams that I want others to collaborate on. I don't want to have to make a copy. If I upload a copy then I have an old file back in my personal OneDrive. If I share the link to this file in the chat it will get lost. Adding a view only option would be beneficial as well.
I have noticed that this is possible by clicking the Attach paperclip icon when writing a new message or by using the Share button in the Files tab, then selecting "OneDrive" instead of "Upload from my computer."
HOWEVER, this file selection interface will only allow you to upload a single file at a time, which can be frustrating.