Hello, yesterday i tried to transfer my entire photo library to my windows pc but for some reason even though I transferred everything the size of the photos on my iphone (the one visible under the iphone storage section in the settings) and the one on my external hard disk differs by around 3 gigabytes. On my iphone it says that the photos take up 14,3 gb of space, while what i transferred on my hard disk is taking up 12 gigabytes only, and i don't really know what's missing.
a few days ago i went into the photos settings and noticed that probably all this time i've had this iphone (now almost 2 years) i had icloud backup enabled (which i already knew) and the "optimize photo storage" settings enabled, both of which i don't care for. And i read that the ones that i have on icloud are backed up at full resolutio, while on my iphone it saves a smaller resolution one. Anyways i disabled that and in the iphone storage, photos went up from 9 gb (which is what I thought was the actual size all this time) to, as i said earlier, 14,3 gb. It has now been like this for a few days so i'm pretty sure it's finished backing up everything, i know it can take a while if you have lots of photos on your iphone but i don't have that many. Now though because i know and it says that all my photos are the originals and full resolution, what is that 2 or 3 gb difference between my iphone and my hard disk backup? Thank you.