IPhone 5: says I'm low on storage but I'm not?

I have an iPhone 5 that I've had for about a year and a half. Everything works fine except for one thing; I can't download apps or take pictures because it says my storage is full. On this phone, I have only six apps other than the ones that came with it. I have 100 or so pictures. But when I go to make a video on snapchat or something it tells me I do not have the available storage. I went to my settings and it says that I have used 12.5 gb and have 56 mb remaining. It also shows that my camera and photos use 8.8 of those gigabytes, which doesn't add up because I don't have many pictures. Is there something I'm missing or doing wrong? Why does it say that my photos and camera take up so much when they really don't?

Try looking at your recently deleted folder and delete those! Maybe your videos are very long so they take up a lot of room. Or if your photo streaming is turned on that may cause some problems!

Sounds like you have some really big video files.

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