@noblestwolf Greetings whizzy wolf of virtual nights.
FYI
- Beware to fall into the trap of outdated docs and false advice
- NC 16 is the stable version – Nextcloud server changelog
- NC 16 Admin Docs » Installation and server configuration
- NC 15 will is legacy and may become unsupported anytime
- upgrade to PHP 7.3. as soon as possible
Hope this helps.
