At a meeting in Hendaye, Spain, Franco presented a list of demands to Hitler that the latter would have to meet in order for Spain to formally join the Axis. This included the right to capture and retain Gibraltar, overseas colonies like Morocco belonging to France, plus economic assistance in the form of food and fuel. Important in Franco's calculations was the fear of British (and later American) retaliation.
(During World War I, both sides tried to win the favor of Italy by offering her concessions in the Austro-Hungarian Empire, and elsewhere, before Italy selected the "Allies" that is, the Triple Entente. This was in spite of the fact that Italy was initially allied with Germany and Austria-Hungary.) And they won Portuguese cooperation in World War II in the use of the Azores for anti-submarine operations.)
During World War II, did the Allies try to induce Franco to join them, even to the point at least trying to "low bid" the above-mentioned Franco demands by offering say, economic assistance but no colonies?