Can someone tell me whether you can use and sync Lightrrom Mobile on an MacBook and an IMac? I don't own an IPad.
Lightroom mobile is compatible with only IOS & Android devices as of now, there if you have Lightroom Desktop software on one of the machine you can sync the Lightroom Collections to Mobile App.
Since you don't have any Mobile Device, you can use Lightroom Web.
You can create a Collection and sync it. and on there another machine you can access it using the Lightroom Web: Adobe Photoshop Lightroom
Let us know if that helps.
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