Manual
A phone that can't find the server, a server that stops, HEIC photos without a picture, a drive the server can't read, and phones after a key change.

Same Wi-Fi, the firewall, mDNS across subnets, and a server that's asleep.

After a logout, a restart or a power cut, on a Mac or on Linux.

Install a HEIC decoder on Linux and restart; older libheif can't read some iOS 18 photos.

Full Disk Access on macOS, permissions and fstab mounts on Linux.

Phones trust the server's key. Keep <data>/tls/ in your backups, or pair every phone again.
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