Canon EOS Rebel T6i W Instruction Manual page 379

[Eye-Fi settings] does not appear.
[Eye-Fi settings] will appear only when an Eye-Fi card is inserted in
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the camera. If the Eye-Fi card has a write-protect switch set to the
LOCK position, you will not be able to check the card's connection
status or disable Eye-Fi transmission (p.352).
Playback Problems
Part of the image blinks in black.
It is the highlight alert (p.310). Overexposed areas with clipped
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highlight will blink.
The image cannot be erased.
If the image is protected, it cannot be erased (p.302).
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The movie cannot be played back.
Movies edited with a computer cannot be played back with the camera.
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Camera operation noise can be heard when the movie is
played back.
If you operate the camera's dials or lens during movie shooting, the
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operation noise will also be recorded. Using the Directional Stereo
Microphone DM-E1 (sold separately) is recommended (p.251).
The movie has still moments.
During autoexposure movie shooting, if there is a drastic change in the
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exposure level, the recording will stop momentarily until the brightness
stabilizes. In such cases, shoot in <a> mode (p.225).
Troubleshooting Guide
379