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Notably, it's not just the tight security of a document editor built atop the encryption foundation that kicked off with an email service a decade ago, but also the feature-set that makes Docs in Proton Drive a compelling option. Just like Google Docs, Proton's service will also let you collaborate on a project with other participants in real-time, see cursor and presence indicators, add media files, and add comments and replies wherever necessary. Users will also be able to export their documents in widely accepted formats like HTML, docx, and txt, among others.

How do you use the new service? It's simple:

Docs in Proton Drive has started rolling out for Proton Drive users as a free add-on starting today, and will appear for every user within the next few days. If you don't already have a free Proton Drive account, you'll need to make one it comes with 5 GB of free cloud storage.If you need more storage than that, a paid Drive Plus subscription with 200 GB will cost you $5 per month. There's also a $12.99 per month plan called Proton Unlimited that includes all the company's premium services.

See more here:
Proton launches encrypted Google Docs alternative: Here's how to use it - SlashGear