Canon EOS REBEL T7I Basic Instruction Manual page 22

Handling Precautions
Cards
To protect the card and its recorded data, note the following:
Do not drop, bend, or wet the card. Do not subject it to excessive force,
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physical shock, or vibration.
Do not touch the card's electronic contacts with your fingers or anything
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metallic.
Do not affix any stickers, etc., on the card.
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Do not store or use the card near anything that has a strong magnetic field,
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such as a TV set, speakers, or magnets. Also avoid places prone to having
static electricity.
Do not leave the card in direct sunlight or near a heat source.
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Store the card in a case.
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Do not store the card in hot, dusty, or humid locations.
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Smudges adhering to the front of the sensor
Besides dust entering the camera from outside, in rare cases, lubricant from the
camera's internal parts may adhere to the front of the sensor. If smudges are
visible on the images, having the sensor cleaned by a Canon Service Center is
recommended.
Lens
After detaching the lens from the camera, put down the lens
with the rear end up and attach the rear lens cap to avoid
scratching the lens surface and electrical contacts.
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Contacts