Phone Cache?

Is there some kind of cache on my phone (Motorola V551) that I have to clean out from time to time to get free space? I ask this because I was on a binge of sending a bunch of pictures/videos I had on my phone to my e-mail address. When I started I had about 84% space used, and after I was done, I went to take a new picture and it told me I had 99% space used, and I didn't take any new pictures/videos in-between.

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Seems like powering the phone on and off would do the trick - should free up anything in the short term memory.