Potentially stupid twitter question topic

I tried searching and got a general cut and paste issue dating back more than a year and a dated and updated story about cut and paste being removed and then returned to the twitter app....but....

Why can I into cut and paste in twitter now on an up to date Note4? I can select one word but it won't allow me to drag that to expand that....I am probably going something stupid, but cut and paste works in other apps easily and I thought I had used it in twitter before.