Why a "professionnal" app like this one that I pay monthly doesn't have a basic function like "dublicate" a photo for different type of edit ? 😡
It has the "Versions" feature which allows you to do different edits on the same photo.
Using "Versions" as suggested by @Jim Wilde is one way-
The selected version will be the thumbnail you see in Grid view.
And you can "Duplicate" one photo by a [Right-Click]:
Also photos edited in Photoshop will appear as separate photos-
Versions work with Lightroom mobile too. On the phone, swipe the edit icons to find Versions towards the right.