To verify that the container is running successfully open
[server-url]/healthcheck (has to return true) and for the version number open
[server-url]/web-apps/apps/api/documents/api.js and check the header comment.
Background
Recently, just about a month after Nextcloud announced their partnership with
Ascensio and featuring a community version of OnlyOffice, the latter decided
to remove support for mobile editing of documents via the Nextcloud app.
This happened without any prior notice and alienated quite a lot of home users,
who would now be forced to pay more than €1.000 to unlock that previously free
feature. Only after some outcries Ascensio deigned to release a statement and
a new, albeit "limited", offer of €90 for home servers.
In my opinion these deceptive practices are unacceptable for a company
advertising itself and their product as open source.