Open Radar

 
I am a senior software engineer working on a Photos Extension. I have multiple machines on which I want to test my code. Photos requires that its Extensions operate through Projects. For instance, one might right-click an album and create a new Book or Calendar. Our Photos Extension properly uses the Photos and PhotosUI APIs to manipulate these projects, and Photos takes care of serializing our changes. I am developing Motif for multiple versions of macOS (High Sierra, Mojave, and Catalina). To do so, I have multiple Macs, each with a different OS installed on it.

One of the things that I want to fix is a problem that we see when upgrading from Mojave to Catalina. One way I could do this is to install macOS Mojave on one of the Macs, create a project, and then update that Mac to Catalina. This, however, is very time-consuming. Instead, I would like to create a project in Photos on a Mac running macOS Mojave, export that project (say, to a USB drive,  AirDrop, Handoff, etc), and import it into Photos on a Mac running macOS Catalina.

I would like a UI for exporting/importing a Photos project. I can imagine this would be useful for everyday users as well.