So what's up with the pulsing grey square

When I click between 2 staves in write mode some times I get a quickly pulsing grey square that quickly disappears and have no idea what it’s associated with. Please explain?

It’s indicating you can start making a marquee selection. It comes up when you long-press.

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Ah ha! That’s what that is! I scratched my head about this too.

Thanks for the answer Lillie.