It is a real drag when we have to find an online hosting service for our images, upload them all and then provide URLs to the images when we create points in story maps. I noticed this with the shortlist story map template.
It is much nicer to be able to add images from our desktop to each feature and have them stored as attachments to that point, much like how the map tour story map works.
Or...... even better would be the ability to do both! Anyway, it would be good to have consistent functionality across all the different story maps so a consistent workflow can be developed, rather than having to handle media/images one way for one story map template and another way for a different one.