Ah! Thanks for this, but I'm still having problems.
I set up a form with a textfield and submit button
Then applied the dataAssist Update behaviour mapping the form text field to the database field.
Changed the textfield to hidden
Created a File Field
Tried to apply the File Manipulation Upload behavior to the File Field
Set up upload directory OK
When I click the lightning bolt on Default File I don't have WA Upload File option!
I vcan see the form though with a a value frmfilename Simple File Name
Tried using thes value but still the database is not updated.
Not sure what I'm doing wrong but I've attached the file