An UploadItem is contained within SecureFileUpload. Each UploadItem corresponds to a required file upload.
The parameters for UploadItem are:
|label||string||-||-||the label for the UploadItem (not shown for single file uploads)|
|name||string||-||-||the identifier with which the file is associated|
|fileType||mime type||-||-||A mime type which lets indicate the kind of file you want uploaded|