You can upload any scene/other corona-related file up to 256MB with this tool. Pack multiple files into an archive. No uploaded files will be shared with anybody else or used for purposes other than debugging Corona without explicit permission.
You can use Corona Uploader to upload scenes that contain bugs that you want to report to our Mantis Bug Tracker or Support System. To save bandwidth, it is best to maximally simplify the scene and pack multiple files into an archive. You can find Corona Uploader under following link: https://corona-renderer.com/upload/.
For detailed instructions on reporting bugs and other problems, please see this guide: How to report issues?