These are the accepted file types: PDF, images (JPEG/PNG/BMP/TIFF/HEIF), and the modern Office Open XML formats (.docx, .xlsx, .pptx) plus HTML.
Legacy formats like .doc, .xls, .ppt, .rtf, .odt, .wpt, .wps, .pages, .pub, and others are not supported.
You would have to use an API call to a document-conversion service (CloudConvert, ConvertAPI, Zamzar, Aspose Cloud, etc.) to convert other kinds of file types to one of the accepted types, or have the API return plain text.
