Hi, I learned (from several threads here) how to transfer photos/video from my mac to my ipad3 by itunes sync. First (about a week ago) I transfered my photoshare folder (with some photos and video files) to my ipad3 via itunes wi-fi sync and it showed up in ipad's Photos fine. Later (about 3 days ago) I did my wallpaper folder and it also showed up together with the previous files all in Photos library. I have set my ipad's wallpaper from 2 of my wallpaper files. Afterwards (yesterday) all my files in photoshare folder (1st sync) suddenly disappeared; only wallpaper files (2nd sync) showed up in Photos. Today I just went back to itunes sync my photoshare folder. I wonder that what's going on with this itunes sync: why ipad won't keep my itunes sync files until I say "delete it"? or I have to sync the same folders every day to keep them in ipad?
Another question: since I use "wi-fi sync", next time when I want to sync do I need to connect my ipad to my mac? I suppose it's not needed, yet last time my itunes seemed to require the connection. What's the issue here? Maybe it requires ipad be plug in power? If so, please confirm.
Appreciate any help.