Canon EOS 80D Instruction Manual page 339

Cautions for Shooting Video Snapshots
When the MOV format is selected, video snapshot cannot be set.
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You can add to an album only video snapshots with the same duration
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(approx. 2 sec., 4 sec., or 8 sec. each).
Note that if you do any of the following while shooting video snapshots, a
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new album will be created for subsequent video snapshots.
• Changing the [Movie rec. size].
• Changing the [Sound rec.] setting from [Auto]/[Manual] to [Disable]
or from [Disable] to [Auto]/[Manual].
• Updating the firmware.
The shooting duration of a video snapshot is only approximate.
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Depending on the frame rate, the shooting duration displayed during
playback may not be exact.
3 Shooting Video Snapshots
339