My question is that I think I have done the filenaming wrong in the write binary file node and I need to understand this in order to complete the level 2 course.
While it looks like you’re setting the file path manually in the write binary node, the data itself in n8n doesn’t have a filename. On the Move Binary Data node, if you add the File Name option like in the screenshot below, that should solve it!
By the way, for the future - you can select all of the nodes in your workflow by clicking and dragging your cursor or hitting ctrl/cmd +A, and then copying with ctrl/cmd + C. From there, you can paste your workflow on the forums between two sets of three backticks (```). Your screenshots here were very clear, but in general that helps us a lot when troubleshooting!