Hi Lauren!
Happy to help with this!
Testing the review link you shared with the NVDA screen reader, the text from your Marker label was not announced. To confirm, have you included Alt Text for the Marker button in your Storyline course?
- Here's a quick screen recording of how the NVDA screen reader interacts with a Marker with Alt Text enabled!
In my recording, I first navigated to the Marker button using the Tab key, then used the Enter key to expand the label box. From there, I used the Down arrow key to move the focus of the screen reader to the body of text within the label box.
If you run into any trouble setting up the Alt Text within your Storyline course, please let me know. I'd be happy to assist further!