With Build a Flipbook visitors can pick out relevant pages in the Flipbook and in that way create a separate publication - only containing selected pages.
Afterwards, the user can share the customized catalog in an email.
How to enable Build a Flipbook:
Go to Settings
Navigate to Modules
Pick Build a flipbook
Enable using the slider
How to use Build a Flipbook:
While on the Flipbook, your visitors can now select 'Build your own Flipbook':
From there, they can choose the pages to use in their own Flipbook:
From there, they can select what channel to share their own Flipbook in:
The channels you can select to share from, are determined from what channels you've enabled under Share optimization. See more on that here: