Bug in PDF from template!

Hi, why can’t we put text over an image when creating a PDF ?

I’ve tried both template source “Word” or “G-Docs” nothing seams to work.
This is a big issue for me as I’m filling official documents that have a branding that I can not change.
So I’m being forced to use external services like Integromat to do a task that is very easily handled by Google Docs API, increasing cost and maintenance.

Does anyone have a magic trick, that I did not think of ?

Other issue, Header and Footers do not work either.