How to paste from omen buffer in x11 (mac os)?

Question

macOS

cmd+v and ctrl+v don't work, although cmd+c copies.
in the x11 settings, sync is enabled.
how to be?
long command, will not retype

Answer 1

I used to insert by middle-click.
I haven’t used x11 for a long time and I don’t know how things are now.
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