Put a button object or link object in the column you would like to represent the files.
Have the click event of this object (the code in the row template will generate for you when you double click the object in the ide, from inside the row template) use the anvil.media.download(self.item['the_name_of_the_column_from_your_data_table']) method found below to trigger the file to be downloaded to the users browser, from that specific row.