Proton Drive allows you to securely store and share your sensitive documents and access them anywhere.
Just opened Drive after upgrading to a family plan and saw that I got access to “Photo Backup”. I contacted support about the iOS beta when it was announced and was told that it’s not yet available for iOS. I am using the TestFlight version but not sure when this came through.
EDIT: I added a link to a folder on Drive which contains some screenshots from the iOS app.