Register the upload handler of the AutoConnectAux.
<dlclass="apidl">
<dt>**Parameters**</dt>
<dd><spanclass="apidef">T</span><spanclass="apidesc">Specifies a class name of the custom uploader inherited from [AutoConnectUploadHandler](acupload.md#upload-handler-base-class) class. Refer to the [appendix](acupload.md#to-upload-to-a-device-other-than-flash-or-sd) for details.</span></dd>
<dd><spanclass="apidef">handler</span><spanclass="apidesc">Specifies the custom uploader inherited from [AutoConnectUploadHandler](acupload.md#upload-handler-base-class) class. Refer to the [appendix](acupload.md#to-upload-to-a-device-other-than-flash-or-sd) for details.</span></dd>
<dd><spanclass="apidef">uploadFunc</span><spanclass="apidesc">A function that behaves when request to upload with the AutoConnectAux page. UploadFuncT type is defined by the following declaration.<pclass="apidesc">`void(const String&, const HTTPUpload&)`</p><p>A data structure of the upload file as HTTPUpload. It is defined in the ESP8266WebServer (the WebServer for ESP32) library as follows: