The framework generates an input field and a button with text "Browse ...". The API supports features such as on change uploads (the upload starts immediately after a file has been selected), file uploads with explicit calls, adjustable control sizes, text display after uploads, or tooltips containing complete file paths.
Set the ajax_id to identify the data request.
The file content will be available in the Application Class in the Ajax_Value field. All other fields can be read from the request->it_form_fields table