I had the same issue and You Tube did not help.  After much searching in the online help I found "Object Snaps".  It needs to be "On" when you create your Walkthrough path.
 
	 
 
	On the main menu bar use "Edit" > "Snap Settings" > "Object Snaps"  or you can use "Shift S".
 
	 
 
	Hope this helps!