One library on several phones

Two or more phones can use the same index. They then share one library: what one phone adds, edits or deletes reaches the others on their own.

1. Install the app on the second phone and sign in with the same Opensolr account.
2. The app asks Re-use one of these indexes from your Opensolr account? and lists your phones. Pick the one whose library you want.
3. The phone reads the index once, then adds its own photos to it. A file that is the same on both phones counts once.

The question comes when this phone has no index of its own yet and your account already holds one. See phones you no longer use.

• A phone never takes another phone's photo out of the index because it does not have that file. A sync removes only files that phone once had itself.
• Two different files with the same folder and name, common with WhatsApp pictures and screenshots, stay two items; neither replaces the other.
• A file deleted on another phone is removed here only if it is the same file. One written here well after the deletion is a new item and stays.

On Android 11 and newer, removing a file another phone deleted may need your yes: Android asks once, the next time the app is open. With All files access allowed (the GitHub version) the app removes it by itself.