Why exactly does this "More Storage Space required" message pop up when installing an app through Google Play store even when enough space is, theoretically available (x more MB needed)? And, on top of that, after deleting one or more apps, this message keeps on popping up, wanting additional space. Interestingly, sometimes x turns to be higher than it was before I deleted some apps. Only when I delete very big apps Store proceeds to the installation. Is that because the play store reserves some of the storage space for itself which is then unavailable to anything else?