Also, i want the FULL resolution images to be saved on my iphone, not the 200-500kb versions.. thanks in advance!
Moving to Correct Forum
If you have Instagram installed on your iPhone, you would use the Share button on the iOS CC app.
It looks like a box with an up pointing arrow.
If Instagram is not on the list, check the more (...) to see if it's allowed to access the CC app.
There are other methods if this won't work. Dropbox is popular https://db.tt/M8EINW7
and has good integration with your Creative Cloud Storage across all your devices.