I went through this as well. This resource should help those starting out: https://github.com/meichthys/foss_photo_libraries

Memos is actually quite a nice option: https://github.com/usememos/memos

If you already run NextCloud, then NextCloud Memories (not photos) is very good.

Nextcloud maps works reasonably well although mobile view isn't great.

The two main ones that come to mind that I use are open sense and home assistant which both have add-ons to backup directly to next cloud

Otp manager is a well integrated 2fa code app Many services like opnsense and others have backup features that integrate with nextcloud.

Memories photos is really good.

If if you already run a nextcloud server you should use nextcloud talk. It has web and mobile apps.

^this. You probably had a Nextcloud client somewhere with wrong credentials that was trying to reconnect repeatedly which locked you out. It happened once to me.

I also useTrilium but I have to say that the mobile experience is pretty poor. You loose the ability to add labels and most of the desktop features are stripped away. If all you need is to simple read and write, then the mobile web app may suffice. There is also a bug where many android keyboards cause typed characters to duplicate (a ckeditor bug)

I'm still sticking with Trilium because the desktop app is super. I'm definitely looking forward to a mobile app at some point (its bound to be developed by someone!)

See here for a good comparison of your options: https://github.com/meichthys/foss_photo_libraries

^ This. The Android app is quite nice. For iOS readers, you should use netnewswire

Nextcloud Memories has good video transcoding support.