I have a galaxy tab A running android 8.1.0. I connected to my PC [via USB] to move some files around and I noticed that it told me that my tablet had 1.5 gigs available out of 10.6. So [from my PC] I checked the size of every file visible on the tablet and it totaled to 350 megs. What is eating up to the other 8+ gigs of memory? And is there anything I can do to minimize it? thanks!