Canon EOS Rebel SL2 EOS 200D Instruction Manual page 348

p Specifying Images for a Photobook
3 Specifying All Images in a Folder or on a Card
You can also specify all the images in a folder or on a card at once for
the photobook.
RAW images or movies cannot be specified.
Do not specify images already specified for a photobook in another
camera for another photobook with this camera. All the photobook
settings may be overwritten inadvertently.
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When [Multiple] under [x1:
Photobook Set-up] is set to [All images
in folder] or [All images on card], all
the images in the folder or on the card
will be specified for the photobook.
To clear your selections, select [Clear all
in folder] or [Clear all on card].