Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 322)

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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.
When [Multiple] under [
x
: 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] .
z RAW images or movies cannot be specified.
z 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.