# WhatsApp Business API - Unsupported Messages

The reason why business might receive a empty message from user

Please note that, This is a list of message formats that WhatsApp doesn't support.

| Unsupported format                                                    | Description                                                              | Example                                                                                                                                                                                                             |
| --------------------------------------------------------------------- | ------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Document file along with caption** *ex. pdf, ppt, docs, csv, etc.,* | When a contact / customer sends you a document file along with a caption | ![](https://1440145200-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F2TgfOHUAGg0ndAgP3vRh%2Fuploads%2Fv87P5CD7UZGL41KkrQbe%2Fimage.png?alt=media\&token=bb7c3c5d-fb3e-4c76-b03c-e596651a2239) |