Under Invoice attachments, add a URL or attach a file. Note that the size of the attachment varies depending on your membership level. The file type must be supported by your specific recipient.
Depending on the receiving settings, the supported attachment file types are:
.bmp, .csv, .doc, .docx, .gif, .html, .htm, .jpg, .jpeg, .odp, .ods, .odt, .pdf, .png, .ppt, .pptx, .rtf, .tif, .tiff, .txt, .xls, .xlsx, .xml