Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 589)

3.
Select a frame to grab.
Use the movie playback panel to select the frame to grab as a still
image.
For movie playback panel instructions, see Movie playback panel .
4.
Press the < > button, then select [ ].
5.
Save.
Select [ OK ] to save the current frame as a JPEG still image.
HEIF images are saved if you grab frames from movies recorded with
[
: HDR shooting ] set to [ Enable ].
Check the destination folder and image file number.
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