I never got around to trying it, but this additional collaboration looks interesting.

Anyone here using Sway?

Simply share an edit link with anyone you’d like to work with. When your family, friends, classmates or colleagues click the link and log in, your Sway will show up on their “My Sways” page, too (with an icon indicating it’s a shared Sway to help you all stay organized). They can edit the Sway just as you can—and at the same exact time as well. As always with Sway, your work is saved automatically as you go along. Microsoft Rolls Out Co-Authoring With Sway [blogs.office.com]

We know we have more work to do, but in the spirit of Sway Preview we wanted to get this initial feature set in your hands right away and get feedback as early as possible.

Microsoft Introduces Sway App For Office [webmasterworld.com]