A bit of a mystery this one.
First, a technical correction regarding my identification of the truck as a Matford.
I had forgotten that Ford Motor Company discontinued the collaboration with the Mathis firm in 1940 and from then forward the Ford products in France were once again called "Ford" or "Ford SAF". Thus, your vehicle is a Ford, not a Matford in an officially correct sense.
However, I do believe that the Ford in your photo was based on the 1940 Matford design which was then built for a few years after the war as well. Thus, it could have been built in the Poissy factory. Or, and I can find no evidence of this yet, Ford SAF might have exported bare chassis or assembly parts to another European country, Belgium and Holland come to mind here, and they may have been assembled there.
Danmark and Sweden are two other such possibilities but rather remote ones.
Just to keep trying to be technically correct, the photo I posted was likely a 1940 model and the photo shows a truck used in a victory parade in 1945, possibly in Paris.
So, am I getting any closer?
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? This week has been a bad week for me in solving puzzles.
Bill