I think they recently rolled it out recently https://proton.me/drive/file-sharing
I think they recently rolled it out recently https://proton.me/drive/file-sharing
Other answers got you covered, but please back up your personal data before doing anything big, even if you are feeling confident
I use the web version of all O365 apps, even Teams, and I also have a Windows VM in case I need the desktop apps for whatever reason.