Error when trying to extract from zip file

[Blondie1992]

I saved a bunch of pictures from my phone (samsung galaxy s5) as a zip folder. Now that I've transfered it to my SD card or even back to my phone, the zip folder won't open and won't let me extract/decompress anything. The error message says "End of central directory signature not found" There's years of pictures involved and I would really like to retrieve them. Please help me someone!