The treaty signed between the French Government and the Spanish Government is not of a military nature, so there is naturally no need to keep it secret.
In fact, the French need to make this treaty public to help themselves recover from their disastrous diplomatic situation. After all, anyone with a discerning eye can see how difficult things are for France now, surrounded by countries that are not particularly friendly.
Similarly, there is no need for Spain to hide anything. Working with the French can even serve as a smokescreen to confuse the British, prompting them to be more cautious in their diplomatic policies toward Spain.
After signing the cooperation treaty with France, the Spanish Government immediately dispatched a diplomatic delegation to France.
