Using unsplash.it random photos in Storyline 2

I wanted to use the random photos from unsplash.it as wallpaper similar to Aman's drag and drop exercise in his LinkedIn post below. Does anyone know how this was done? I am creating a trigger and using the URL but it opens up a separate browser window. I'm sure it's got to be something simply I'm doing wrong.  (https://www.linkedin.com/pulse/arrange-words-form-meaningful-sentence-aman-vohra?trk=v-feed&lipi=urn%3Ali%3Apage%3Ad_flagship3_feed%3BkEpUn9Ajg847Q2UqzTa94Q%3D%3D)

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