I had the same issue that I posted about here: Correctly patch MAX_ASSET_UPLOAD_FILE_SIZE_IN_MB
While I wasn’t able to figure out a solution for the new MFE, I worked around it by just disabling the Django waffle flag contentstore.new_studio_mfe.use_new_files_uploads_page which reverts to the legacy uploads page. It’s not necessarily a “fix” but at least it renders your existing patch functional