When you have an instance of Digital File Pro Upload on the page for an ASP page, you should see in the Bindings panel a set of bindings for your form. Each field within the form should be listed (except for the upload field). In this case the MM_insert field should be listed. If you drag that binding onto the page, then you should see the proper syntax to refer to the field value. For me with a text field it dropped:<%=WA_DFP_UploadObj.Form("textfield")%>
So, try:
If (CStr(WA_DFP_UploadObj.Form("MM_insert")) = "form1") Then