You are using the dreamweaver native insert behavior which will not work with file upload.
you need to use the Data Assist insert record behavior instead.
to add the data assist insert record behavior, open the server behaviors panel, click the plus button and select WebAssist -> Data Assist -> Insert -> Insert Single Record.
for the column that you wish to store the uploaded file name, click the lightning bolt icon and select the Uploaded Files(File Field Name) -> Server File Name binding. for the other columns, select the corresponding form element binding.