So I have put it off for a while but I've just upgraded to iOS 12.2 on my iPhone 8 through iTunes on my PC. Before I did this I had about 27GB storage space left on my iPhone, but after the upgrade I have about 13GB left. It shows that the vast majority of space was taken in documents and data. Is it possible that this update took up 14GB of space on my iPhone or what should I account this sudden storage space decrease to? Thanks for any advice