I recall spreadsheets being particularly painful on mobile when I’d try to select multiple rows and it would select way more at a time but would need to fouble-check that or find a screen recording if I made one at the time.

The main issues is there was a bug where if there is an open session for a document in Collabora (including dead sessions say from mobile) and that Collabora server is shut down in the wrong order, then all changes including if you click “Save” will be lost. A bug was opened for this and closed by making sure the servers shut down in the correct order, but I don’t know if that fixes cases where the servers a hard shutdown.

Fingers crossed this can be a viable replacement for Collabora Online with Nextcloud, which has been a nightmare.

You would need a way of verifying that the SHA256 is a true copy of the site at the time though and not a faked page. You could do something like have a distributed network of archives that coordinate archival at the same time and then using the SHA256 then be able to see which archives fetched exactly the same page at the same time through some search functionality. I mean if addons are already being used for doing the crawling then we may be mostly there already since said addons would just need to certify their archive and after that they can discard the actual copy of the page. You need need a way to validate those workers though since a bad actor could just run a whole bunch at the same time to legitimise a fake archival.