Currently, external users cannot directly upload files to a Decile Hub data room. If you need an external user to contribute a file, they would need to send it to an internal user who could then upload it to the Data Room. However, your suggestion for allowing external users to upload files directly to a data room is valuable and has been noted for potential future enhancements. For now, sensitive information should be securely shared via email, or other secure methods, before being uploaded to the data room.