PROTECT/CANCEL
Protects files from being deleted accidently.
“Protecting/Releasing Protection of the Currently Displayed File” 
“Protecting/Releasing Protection of Selected Files” 

COPY
Copies files from the built-in memory to the SD card.
“Copying Files to an SD Card” 

TRIMMING
Select the required part of a video and save it as a new video file.
The original video remains in its existing location.
“Capturing a Required Part in the Video (TRIMMING)” 

SEAMLESS REC CTRL
Videos that are recorded on two separate media and with “SEAMLESS RECORDING” in the video recording menu enabled can be combined into a single
video.
“Combining Videos Recorded by Seamless Recording”