Answered
My Fresco is missing the Reference layer - is this only for iOS?
I don't see the 'Set as reference' option in the action panel.
I don't see the 'Set as reference' option in the action panel.
I just checked and it's definitely here, are you on the last version?

see my screenshot (4th from the bottom of the layers actions)

Your version can be found by going to the app settings, then, About"

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