Ok, i discover something interesting, here are some notes:
I tested another completely different site (not with hugo). I look for a simple HTML site with dependencies on the same folder and another with dependencies on another folder; for example:
1.- folder/index.html, folder/style.css → This resources are displayed correctly to end-user
2.- folder/index.html, folder/js/script.js → This resources aren’t displayed correctly to end-user and trigger 404 errors:
So the problem itself isn’t hugo (of course, i never blamed hugo for this issue, just a little guide to fix this problem) but GCS and i’ll try to find a way to fix this.
Now, another question, to which project should i raise this issue, if someone knows (meanwhile i look for that info), i’ll be very grateful.
And … i don’t know if the documentation related to “GCS” should be updated, because isn’t so much as “hugo deploy” and “magic!”.