Can't delete photos
I'm trying to free up space on my iphone 6s Plus running ios 13.x but they won't delete. Googling, it's suggested they're synched - but I have icloud sync on only for my texts and voice memos, and I didn't intentionally sync them to my PC. Trying to unsync them if I did accidentally, I'm supposed to do it via iTunes, but when I try to open iTunes today it says I must delete the old version before continuing. Why? Yesterday, clicking on the same icon, iTunes simply started, today it won't. I don't want any new versions of anything and I don't want anything synced to anything.
Oh and also, yesterday all my mail on my phone vanished when I was trying to back my iphone messages (only) only to iCloud - I kept getting not enough room when the messages were only 50MB and I had 3 gigs free on iCloud - now I keep getting that I have to buy more space - what BS!
iPhone 6s Plus, iOS 13