Copy and Paste in Scrollback mode (screen/byobu)
Enter scrollback mode: F7
Move the cursor to the start of the text you want to copy, hit spacebar
Move the cursor to the end of the text you want to copy and hit enter
To paste text, Alt+Insert
Another solution:
shift-f3 - move to split to be copied from
alt-pgup - enter copy mode
space - start selection
cursor through desired text
enter - end selection
shift-f3 - shift focus to split to copy to
ensure receiving vim is in insert mode
alt-insert - paste selected text
https://askubuntu.com/questions/37455/how-to-copy-command-console-text
https://stackoverflow.com/questions/25923952/how-to-copy-from-one-split-and-paste-in-another-in-byobu