Unfortunately you can not drag and drop into the Formativ Form. I think it is working as designed, however, I have asked the engineers to comments on this issue.
In Formativ Form, you can drag and drop in between controls (i.e. List View, etc). Let us know if you need sample code.
For the moment, I think the only alternative is to include a browse button in your form to select the file. you can drop “Open dialog” to your Form (Formativ IDE – Dialogs) and use the code below to select the file.
if (TestDialog.OpenFileDlg.execute) then msgbox TestDialog.OpenFileDlg.filename end if
Hope this helps.