It's always really hard to find good software when you have very specific needs.
I need a password manager that has apps for desktop and mobile, doesn't require an account on the vendor's site, can reliably sync between multiple devices, secures its data with a passphrase and supports attaching custom strings and files to password entries.
The closest I've gotten is KeePassXC, KeePass Touch and Keepass2Android, synced over Dropbox, but the "reliably sync" part keeps breaking...