Most of what you did will work okay. But somehow, you broke the link from the disk to the timeline, or you actually made two timelines and only linked one. If you do what you described, you do not get an orphan timeline, and the video is first play. You set the end action to the video (loop), so either broke that link or added a second timeline that is the orphan.
Do NOT set the override.
If you are going to use a menu, it simplifies to add the menu first in the Encore project (sets the "menu remote" and first play to the menu).
The squiggly thing is the "pickwhip."
If no menu added first, set the title remote by selecting the disk in the flowchart and drag Title Button to the video. You don't describe doing this, but you also don't get an error.
Easier: Instead of importing as assets, import "as timeline," and pick both the video and audio file.
You set the end action to the video, and that would make it loop. Normally, you would do as cvid says, and set an end action for the timeline back to a menu. You don't have a menu, but you could also set the video to just stop. In the project panel, select the timeline (not the asset). In its properties panel, set it to stop.
AdChoices