The cover photo is optional.
You can choose a theme for your project, which consists of harmonious colors and typefaces. I chose to use the full-screen view for most of the photos because it provides this overlay for the captions.
Click on any of the following photos.
(There is no undo/redo, which makes me feel like this.)
The interface is nearly identical to Adobe Voice. When you add content, it automatically prompts you for the next asset. Alternatively, tapping the plus sign at the bottom of the page shows you what assets you can insert.
With a windowed image, you can choose the area that will dominate the window as it scrolls.
The image picker and the grid view. You can select which images go where.
Your upload options. Basically, you can send to social media or to Adobe's hosting site, slate.adobe.com. Projects can be public or only accessible via a direct link. There's also embed code.
Rearranging things is also a bit annoying. Like an elevator without floor numbers, you hit the up or down but can't see where you are, so you have to stop, look and decide if you're done moving.