Here is the App Store description...
Named App Store Editors’ Choice, Slate lets you turn your next newsletter, report, invitation or travel adventure into a gorgeous visual story that delights readers on any device. Simply tap to select a unique look — beautiful fonts, color and magazine-style design are automatically incorporated. Fluid movement and elegant motion are applied instantly. Share your Slate story link anywhere. Grab attention, increase awareness and inspire action. Stand out.
I suggest creating one teacher account for all students to use in the elementary level because creating an account requires an email address. It is a good idea to use a student friendly password so that the students can log in.
Below is one that I created to share with my students. You can embed your own projects... and here is a link to a 2nd grade student Adobe Slate. https://slate.adobe.com/cp/VcoEa/