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And here is another variant. It is a bad hack but it also scrolls at second and subsequent clicks. Works quite different from the previous examples.
Still everything is at the placeholder. You don't...

Here is s light variation that doesn't need changing the code. Just move the placeholder to where you want the pop-up layer to be scrolled.

Not sure if I understand what the requirement is, but something similar might have been discussed in this THREAD. But unfortunately the latest example has stopped working in V12.
The example below...