If you're like me, you've got photos strewn over a variety of storage devices: local, on the web, maybe even some off-line storage. Keeping track of these images is a real pain. I've got multiple image editing apps: Lightroom, Photoshop, Luminar Neo, and some dedicated astronomy editing apps. I'm also a former Aperture user (groan). Lightroom has its own catalog system, and it's very good. But I've also got photos in the Neo catalog (it's not so good as a catalog) and all my iPhone photos in Apple's Photo app.