We’ve rolled out an update which includes support for PDF files, images, audio and other file formats. This update doesn’t yet include support for video files but we’re working on it and will have more to share soon!
An error occurred while saving the commentDimitris commented
We need to have documents made available online for editing but users with edit access should not be able to download the whole file.
So the "do not download" restriction should be available for both view and edit.
Users should also be able to use the desktop client version to collaborate and edit, but the option to save the file outside the original onedrive for business location of the author should be disabled.