The uploader control allows you to add additional data on file upload, which is used to get in the server-side. By using uploading event and its customFormData argument, you can achieve this behavior. Refer to the following example.
@{
var asyncSettings = new Syncfusion.EJ2.Inputs.UploaderAsyncSettings { SaveUrl = "https://ej2.syncfusion.com/services/api/uploadbox/Save", RemoveUrl = "https://ej2.syncfusion.com/services/api/uploadbox/Remove" };
}
<div class="control_wrapper">
<div id='preview'></div>
<ejs-uploader id="fileupload" uploading="onFileUpload" asyncSettings="@asyncSettings"> </ejs-uploader>
</div>
<script>
function onFileUpload(args) {
debugger
args.customFormData = [{ 'name': 'Syncfusion INC' }];
}
</script>.control_wrapper {
max-width: 505px;
margin: auto;
}