A film supply apparatus supplying film in a foam-in-bag system having a film feeding device for feeding film from a film source to a location for bag formation, a bag forming apparatus, a foam material dispenser positioned for feeding foam material for reception in a bag of the bag forming apparatus, and a web tensioning system with a web tensioning driver in driving communication with the film source and which is in communication with a controller for monitoring the film feed and web tension states and directing adjustments in the web tension system. The web tensioning driver is arranged to move film backwards or in a direction opposite to a direction of film feed induced by the film feeding means and with the film source including a roll of film and the web tensioning system including a drive transmission in communication with the roll of film for rotational driving of the roll of film and also in communication with web tensioning driver. There is further featured a spindle support for supporting the roll of film and a roll film core drive insert.