contentType
contentType:
| "image/png"
| "image/jpeg"
| "image/jpg"
| "image/webp"
| "image/gif"
| "image/svg+xml"
| "image/tiff"
| "image/bmp"
| "audio/mpeg"
| "audio/mp3"
| "audio/wav"
| "audio/ogg"
| "audio/oga"
| "audio/aac"
| "audio/mp4"
| "audio/flac"
| "video/mp4"
| "video/webm"
| "text/plain"
| "text/html"
| "text/css"
| "text/csv"
| "application/pdf"
| "application/msword"
| "application/vnd.ms-excel"
| "application/zip"
| "application/json"
| "application/xml"
| "application/octet-stream"