Believe it or not, Plex. It's a truly mediocre photo organizer, with glaring missing features, but because I already have a Plex server - it's zero marginal work aside from just dropping the photos in a folder on the NAS running it.

I use FileBrowser to autosync the photos off my phone, and family can easily access them because they already know how to use Plex. The fact that there is a client for every device I have ever used is icing on the cake.

If you have a plex server, obviously a very big if, worth investigating just turning it on for a folder of files since it doesnt write to the images itself by default.