Support form Adobe AcroForms?

Can anyone confirm or deny if Adobe AcroForms are currently supported? I get the following error when attempting to eslClient.UploadDocument(doc, pkg) : Could not upload document to package. Exception: The remote server returned an error: (500) Internal Server Error. HTTP POST on URI https://sandbox.esignlive.com/api/packages/piTy64_g4qceAa0i-EtgsmO-Rk0=/documents. Optional details: {\"messageKey\":\"error.internal.default\",\"technical\":\"error.eslx.inputValidation.documentPreverifyError [#f124c212-606d-44cd-9dc6-31d8713e77b9]\",\"message\":\"Unexpected error. We apologize for any inconvenience this may have caused you, please try again. If the problem persists, please contact our support team.\",\"code\":500,\"name\":\"Unhandled Server Error\"}" I have attached the file I attempting to add to a package. It also fails if I attempt to add the form using the WebUI, so I guess my question is answered? Thanks Glenn