Canon EOS M6 Mark II Advanced User's Manual page 175

Cautions for Setting Multi Shot Noise Reduction
If there is significant misalignment in the image due to camera shake, the noise
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reduction effect may become smaller.
If you are handholding the camera, keep it steady to prevent camera shake.
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Using a tripod is recommended.
If you shoot a moving subject, the moving subject may leave afterimages.
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Auto image alignment may not function properly with repetitive patterns (lattice,
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stripes, etc.) or flat, single-tone images.
If the subject's brightness changes as the four consecutive shots are taken,
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irregular exposure in the image may result.
After shooting, it may take some time to record an image to the card after
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performing noise reduction and merging the images. [BUSY] is displayed as
images are processed, and shooting is not possible until processing is finished.
[Multi Shot Noise Reduction] is not available with bulb shooting, shooting with
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AEB or WB bracketing, shooting RAW or RAW+JPEG images, or with features
such as long exposure noise reduction, or HDR mode.
Flash photography is not possible.
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[Multi Shot Noise Reduction] is not available (not displayed) when recording
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movies.
The camera automatically switches to [Standard] if you set the power switch to
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<2>, replace the battery or card, switch to a Basic Zone shooting mode, or
switch to movie recording.
High ISO Speed Noise Reduction
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