There's a known, temporary issue with uploading .zip files: https://godotforums.org/d/30141-the-forums-are-up-again-migration-to-new-forum-platform/28
But 192MB is a huge file. You should be able to reduce the size by excluding files not needed to run the project. For example, the .import subfolder.
Note that on this new forum software, google drive shares get embedded really nice for preview, for an example:
Just press the expand icon on top right and you get taken to the google drive page that you can download it from.
