1) when using File Upload, a new binding group is created on the binding panel, "WA Uploaded File (<File field name>)", where <File field name> is the name of your file field. This binding group contains a Server File Name binding that contains the name of the file that is created in the server
in the insert record and update record behaviors, bind the image column to the Server File name binding
1) In the file upload behavior, set the Default File setting to noimage.jpg