Edit > Copy
Copies the selected image(s) to clipboard.
Edit > Paste
Inserts contents of clipboard to the active panel.
Edit > Select All Selects all images displayed within the active panel.
Edit > Invert Selection Inverts selection of files within the active panel.
Edit > Delete Deletes all images selected within the active panel.
Edit > Snipping Tool Equals the
Edit > Snipping Tool command in the main menu.