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There are five domains to whitelist for the application to be functional:

www.sutori.com
assets.sutori.com
d1ox703z8b11rg.cloudfront.net
hstry-education-production.s3.us-west-2.amazonaws.com
owcqxq3rnb.execute-api.us-east-1.amazonaws.com
'http://api.unsplash.com/'

We also have an in-app chat that may be of use to teachers who require support (enable the domains "crisp.chat" and "crisp.im").

Finally, a student or teacher can embed various resources into their stories. This could be a video from YouTube or Flipgrid, a Quizlet, Tweet... Naturally, for this feature to work, the respective service should also be whitelisted.

Teachers! If needed, forward this to your tech department.