Copying and pasting a group of frames at once

How do you copy and paste a group of frames? Right now I can only copy and paste the image frame by frame, which is really time-consuming.

Click and hold until you select the frames you want to delete, copy, or move!

Here, like this:
Untitled_ Apr 29, 2020 2_32 PM
After you select them, you can click ctrl+c to copy and ctrl+v to paste, and click and hold them to move them around.