Hi Danna, well first off, Scripts/Actions are not an area of AR that I play with much I must confess
So other users here may have better more helpful insights than I about this!
However after trying what you described, and looking at the resulting Action script in a text editor I note that no 'Events' are recorded after the 'Header'.
Two possibilities;
A: This is to be expected and you can not record changes of Samples.
Or:
B: It’s a bug, and you really should be able to record said Sample changes.
Right now, I think your guess is as good as mine as to which it is; A or B?
If you want to look at the Action script you made you can find it from within AR via the Menubar: Tools > Actions > Actions Folder…
Sorry, non of this is probably very helpful to you is it