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I pulled thse digitzer off an lg g3 nd this black film came off with it, now is that film the lens so the color shows because I started the phone and the screen was white (while digitzer was unplugged and removed. I also ordered anoher digitizer is that black film spose to be on it? If not can Someone tell me what that film is and what it does so I can order it?

It’s probably the polarizer film. The digitizer and LCD are fused together in this model, and you should use the screen assembly that includes both the digitizer and LCD when replacing it. Trying to replace just the digitizer is not going to work, without professional refurbishing equipment.