Copy paste in mobile browser

I d like to marking some text for copy paste funktion and I cant do it… So, why? Thank you

@AS888,
Long-press on the text and wait for the device to bring up the text highlighter. Is this not working for you?

Oh its funny, it works here but doesnt work at mobile facebook and some others pages

@AS888,
Can you be more specific? What other sites are you unable to do this on? Seems to be working for me on Facebook – testing using my Samsung Galaxy S9+.

So I need it for a a copy a emails etc from facebook, and wenn I make a long press I get a get a window with other options, but not copy paste. S Screenshot