In my session on creating "stories" for SLP Summit last week (recording available free until August 15, Register here), I focused on thinking about features of resources that might make a clinician pick one over another. You may pick Pic Collage if you like using your iPad, doing a pass-and-add playlike activity (I learned from the authors of We Thinkers that add-a-thought=play=conversation), or want the versatility of being able to quickly cut around any image. You may have seen in my recent post on Google Slides/Jamboard that this is not always QUITE as easy there. So always be thinking FEATURES.
Pic Collage, free, available for iPad, Android, and runnable on new Macs (M1 chip) allows for the creation of a visual as-you-go, so that student contributions to the context can be instantly reinforceable, and it is easy enough for them to use themselves. The menu allows you to add photos from your library, search the web for photos (a school-clean version of BING), and also add text or doodles (powerful because you can sketch things that may be hard to find photos of, or sketch over a photo)
As I showed in the session, you can start with a setting (story element teaching) and add elements of the setting (descriptive sequence level of narration) or introduce an initiating event, such as the bear! Double tap on any picture you add to be able to "trim" around it.