Could be an acetobacter infection.
That film will stick to the sides when you empty your fermenter. But the bugs are still there.
You don't need to dump it. It will eventually taste like vinegar but you may have some time before it gets there. It may be fine for several weeks.
This is one of those: a) drink quickly, b) wait a long time and see if it gets better over time, or c) dump it.
My choice would be to drink it rather quickly. The taste evolves. Make a decision as you go. May have decide b) or c) after that.