CSS Form Builder includes the File upload Functionality of Digital File Pro.
The File Manipulation -> Upload behavior of CSS Form builder will is the same as the uplad File behavor of the older Digital File pro.
the Upload behavior can upload files to the servers file system, it cannot upload files into the MySQL database.
Instead of storing the actual file in the database, you upload the file to the servers file system and store the file name in the database.
to store the file name in the database, you need to use DataAssist.