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Today I noticed some hidden functions in the iPad Pro version floating buttons.

If I select the Move tool (the Cursor Arrow with Cross) and hold my Eyedropper quick button while tapping on the screen with my Apple Pencil, it duplicates the layer I am working on. Is this a glitch? Are there more secret functions? Is there instruction manual for this somewhere?

Hm, eyedropper usually bind at the ALT key at PC version. Also as in photoshop you can hold alt and move layer to get copy, that's why you get this effect.