I am not sure why you plan on updating an asset monthly.
If you create a game, updated ressources are bad. Worst case, you deployed the game to players, an asset changes and the updated asset breaks the game somehow. Or it does no longer fit together with other assets.
You talk about "major" update. Major means, that it is not some insignificant update. It is crucial new features and not just a planned regular update. But that's my opinion. I think the term major update is used far too frivolous on Itch.