ChatMessageAttachmentDto

{
    "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",
    "messageId": "8540d774-4863-4d2b-b788-4ecb19412e85",
    "fileName": "string",
    "contentType": "string",
    "sizeBytes": 0,
    "storageKey": "string"
}