yes, on the update page, create a hidden form element. set the initial value of the hidden form element to use the value from the file column in the recordset.
In the upload file server behavior, click the lightning bolt next to default file and select the hidden form element.
this is covered in the "How to apply Digital File Pro to DataAssist Insert and Update pages" tutorial in the how to section of the DFP support page:
digital-file-pro/