Why is the Age of Empires 4 resize module release limit 17MB?

I recently made a full civilization enhancement package, “Full Civilization Enhancement Package - Modified version”(全文明加强包-修改版), but once the size of the adjustment package exceeds 17MB, it cannot successfully publish the module, and it keeps showing that the project is still waiting to be edited, waiting to be uploaded. Is there anyone in the community who knows the reason, or is there any way to reduce the size of the package?