Why Page Orientation and Sizing Aren't Automatic
Compiling multiple images into a single PDF sounds like it should be a trivial "just stack them" operation, but images come in wildly varying dimensions and aspect ratios, while PDF pages need a consistent, defined size (like A4 or Letter) and orientation — reconciling these two things is where actual decisions need to be made, not just automatic default behavior.
An image significantly wider than it is tall fits far better on a landscape-oriented page than a portrait one, and mismatching orientation to image shape produces a page with large, wasted white margins on either side, or worse, a scaled-down image that's harder to read than necessary. Choosing paper size (A4 versus Letter, for instance) also matters beyond just aesthetics — a document meant for a specific regional printing standard should match the destination's actual expected paper size, not an arbitrary default.
Image order in the final document matters too, since a batch upload rarely arrives in the exact sequence you want the pages to appear — reordering before compiling avoids needing to re-do the entire conversion just to fix a page sequence mistake discovered after the fact.