Moving a course in D2L to Articulate Storyline 360 (Need Help)

Hello, first time poster here. I created a "course" in D2L in January of 2021 for high school teachers; the course was about asynchronous teaching online in D2L. As I try to transition out of K-12, I am creating a portfolio. Having been with my school district for 11 years, every training, scenario, infograph, and QRC lives in Desire 2 Learn (Brightspace or Daylight, I can't recall.) How can I move that material over? I am able to download it as an HTML file, but then what? I was hoping to avoid recreating dozens of courses, but I cannot include them in a portfolio as they are. Can anyone please offer advice? Thanks in advance. 

I am attaching a screenshot from D2L, in case you're not familiar. Users have to click those arrows (circled in red) to navigate through the course. 

I would be using Articulate Storyline 360.

Most sincerely, 

-Heather