Also I would love to ditch google drive in favour of Proton Drive, but the reason I can't is the slow transfers. I need to share large media files typically larger than 1GB, but no matter how or what device I try it from I can't upload them faster than about 2 or 3 Mbps. Unless that changes then for me it's moot whether I can sync with Proton Drive or not.

Agree, so long as it's not restricted to one type of phone only. I still don't understand why iOS is usually catered to first when there are more than double the number of Android users. Time and again, developers only support iOS at the expense of the larger Android market. I'm in pro audio and it happens all the time there too, they only develop an iPad version of an app simple enough to run perfectly well on cheap Android devices.
So by all means I agree with these features but please don't restrict the app to one mobile OS!

This would allow me to leave Google completely! Right now, I'm keeping it just so I can use Google Docs and Spreadsheets.

It is very difficult to use proton as a business platform without file sharing.

Working with OnlyOffice to provide this would be cool

I'm considering using Drive for my team but the lack of this feature is what is currently holding us back.
The ability to edit files and have the changes be visible to other users in real time is very important to us.

Maybe there could even be a Proton alternative to GitHub. That'd be nice.

I vote for a privacy-first, open source, office suite. It does not need to be as powerful as the Microsoft Office tools, but a basic word processor, spreadsheet, and slideshow suite would be all I need, especially since you already provide Drive, Mail Pass, Calendar, and VPN. If I had those tools, I could avoid both Microsoft and Google!

Onlyoffice, CryptPad, and Nextcloud Office are three excellent free and open source projects that would be extremely easy to fork and create a Proton productivity suite!

a good reader would be sufficient. I don't see Proton as a full replacement of all the Google Services. I also don't expect Proton to come up with an alternative for Google Maps or Google Photos

So much this. Not being able to sync what I'm editing but needing to download to edit then upload again to share it really impacts workflow across devices.

Also would be great to see Proton be offered by more devices as a syncing option, I didn't really expect Proton Drive to work with my Freewrite or Supernote enote out of the box but it was still disappointing to not have that option at all, since I can't download the Proton Drive app onto them like I can with my Boox enote, but are rather stuck with their default syncing and/or backup offerings like Google if I want or need to use online syncing instead of usb transfers.

Granted syncing stylus note-taking is probably another thing entirely from syncing typing so I'd probably still need to download things into my enotes native platforms for handwriting and editing things in but it would still be nice to have better sync options in general, and maybe consider enotes syncing options as well in the future please?

This would be remarkable! Proton having same features as google, maybe even better or different in Proton's own way.

FOR LINUX! FEATURES PARITY!

I echo this, but please design it for Linux as well. I also use KDE like a user below, but it should ideally be available for all major, recent iterations of linux

This is literally the one thing I need to divorce myself from Google totally. I need cloud document editing.

Collaborate with libre office or open office teams to incorporate?

I'm not sure I'm convinced that this is a direction I'd want to use Proton services for. However, it might be compelling to me if Proton collaborated with CryptPad to provide this functionality. CryptPad is a secure, real time collaborative, online office suite with many good features. It's open source, so the idea of Proton launching a CryptPad instance that is integrated with all the other Proton apps could be useful and would likely bolster that project further. https://cryptpad.org

This is very similar to Dropbox Family Folder. I think both family and professional groups would appreciate at least the ability to have a connected shared folder that all could access with security (read or write) set for each user. As a grander option maybe have folders be allowed to be accessed (per security rule) by and user in the group.

There is already a Deskop App for Proton Drive (Windows). It's inside the web version.
https://proton.me/download/drive/windows/Proton%20Drive%20Setup%201.3.9.exe

This is critical for Proton Drive to be useful for business. Using links does not give the same utility as sharing complete folders to be used within Proton Drive.