The real answer to this question is France's contribution in the victory was extremely important--for reasons that are not always understood. Though the Germans conquered France, the Luftwaffe losses in the Battle of France were catastrophic. https://twitter.com/CrumbMontgomery/status/1391133116278919176

When the Germans attacked France they had more than 3000 operational aircraft (which helps explain their victory). When the Germans started the Battle of Britain a few months later, the Luftwaffe's operational strength was only half this, one of the reasons for their quick defeat

When the Germans lauched Barbarossa, they had only about 40% as many operational aircraft as when they attacked France--which helps explain one of the reasons for their failures in 1941. (the other reason was they still had a very large number of aircraft fighting the British)

So the French contribution was to help destroy so many aircraft in 1940 that the Battle of Britain ended quickly and Barbarossa failed. People who like to denigrate their contribution should acknowledge this.