Hi @alcarazr,
I found this reference in the forum Create a custom id for each post - #6 by Jura - I apparently already struggled with a similar issue (can’t remember in which context exactly) and used .File.UniqueID… My researches ended there at this time
A solution may be to concatenate this .File.UniqueID with another variable to minimize the risk of collision.
If anyone wants to have a look, the template of @alcarazr is here fisiquimicamente/cusdis.html at 524f439a6db0d6770863389c5b849f4916a8a8f2 · rodrigoalcarazdelaosa/fisiquimicamente · GitHub