Some plug plants have this material wrapped around the roots forming a cell in which they are grown. Lots have tiny holes for the roots to emerge. Although they can be potted-on with this membrane still intact, I always remove it as long as there is little disturbance to the roots.

If you can remove the film without disturbing the roots I would tend to do so. There used to be a lot of trouble with the fibrous pots which plug plants were sent out in a few years back. Be interesting to know what the 'film' is made from. I know they produce a wood based plastic for use when growing Maize in Britain which then breaks down and is ploughed back into the soil. This could be similar.

Snap J.