How do I delete a photo / delete a blank page?

On iOS:

To remove a photo from a page, tap on the page to enter Page View, tap on the image, and select the Remove image option.

On Android:

To remove a photo from a page, tap on the page to enter the Page Editor, tap on the image, and select the option to Remove Photo.

Deleting a blank page (iOS & Android):

After removing the photo(s) from the page, if you do not want to add a new photo to the resulting blank page, in Book View you may tap on the X  in the corner of the page to remove it from your album.