What happens if I Auto-align my photo?
The greyed out margin in every page indicates the portion that is likely to get trimmed when the album is made.
If you position your photo/text very close to this margin, the photo or text will be automatically aligned to the edge(s) of the page, to get a full bleed spread, i.e., to spread the photo or text out till the edge(s).
There's a chance that a marginally small part may be cut away from the photo or text at the edge(s) of the page. Anything between 0-3mm can get trimmed from the sides of the pages and 0-10mm from the covers.
But if you do not want any part of your photo or text trimmed, please avoid placing them very close to the grey margin.