Remote Assist allows Teams Users to share files to HoloLens users, but there does not seem to be a way for HoloLens users to share files with Teams Users. Right now you can take a picture with the HoloLens and share it with the teams users, but if you want to access your own files via one drive, you cannot share them to the Teams Users, you can only view them in the HoloLens.

Please allow the HoloLens users to share the same file formats from their attached One Drive, or Local Headset Storage, that Teams Users can share.