Canon EOS REBEL T6S Instruction Manual page 250

Shooting HDR Movies
The recording size is fixed at [1280x720 29.97fps (Standard)] (it is fixed
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at [1280x720 25.00fps (Standard)] if [53: Video system] is set to
[PAL]). If [HDR Movie Shooting: Disable] is set, the recording size will
revert to the original setting.
Since multiple frames are merged to create an HDR movie, a part of the
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movie may be distorted. During shooting while handholding the camera,
the distortion caused by camera shake may be noticeable. Using a tripod
is recommended.
Note that even if a tripod is used for shooting, afterimages may be
noticeable or noise may look increased during the HDR movie is played
back frame-by-frame or in slow-motion compared to when it is played
back normally.
HDR movie shooting cannot be set if movie digital zoom, video snapshot,
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or Miniature effect movie is set.
Still photo shooting is not possible.
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