https://skmtc.net/hmrc/apis/secure-data-exchange-service-misc-api/docs/misc/sdes-file-upload/files/upload/url/:srn/post 2026-07-13 0.5 https://skmtc.net/hmrc/apis/secure-data-exchange-service-misc-api/docs/misc/sdes-file-upload/files/upload/url/:srn/:informationType/post 2026-07-13 0.5