Getting a 400 Bad Request when a customer tries to upload a 2.5MB PDF via the Genesys Cloud Web Messaging SDK. The config allows application/pdf and the size is well under the 10MB limit. The error payload just says Invalid file format but doesn’t specify why. Checked the MIME type in the browser console and it’s correct. Is there a hidden character limit or a specific encoding requirement for the multipart form data that the docs missed?