Thread:Mainframebabe/@comment-30339728-20161111124637/@comment-27642721-20161111143628

Sometime updates just overwrite everything so may need quite a bit of space. I also have no Apple/iPhone/iPad experience but a quick Google found this link with things to try:

https://www.imyfone.com/iphone-space-saver/fix-not-enough-storage-iphone/