post https://{Subdomain}.kissflow.{Region}/process/2//////attachment
This endpoint lets you upload an attachment file to your process' form field. You can add an attachment in the following file formats - .pdf, .doc, .ppt, .xls, .jpg, .jpeg, .jpe, .png, .gif, or .mp4. Please note that, for encoding images, only blob data type is currently supported and not Base64.