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From looking back at the release notes for version 11.0.3, it looks as though there should be a command for adding 1 instance before the current frame. But in looking through the keyboard shortcuts for the Handy Custom Panel, all I am finding is a command for adding 1 instance AFTER the current frame.
Does such a shortcut exist? If so, where do I find it?

BruceM wrote: ↑24 Oct 2018, 22:42 From looking back at the release notes for version 11.0.3, it looks as though there should be a command for adding 1 instance before the current frame.
Does such a shortcut exist? If so, where do I find it?

Shortcut = Layer>Insert Single Image Before Current Image

That did it!
Thanks Svengali!