From what I have read, no:
"One of the crucial things to understand about script triggers is they they are always tied to the user interface, not to the underlying data tables or fields"
From that I gather that if you change the data outside of Filemaker itself, it will not invoke a script trigger to run your script. Maybe it would if you use IWP; not sure about CWP.
Thank you so much for your rely. I think you are accurate. Appreciate your help.