Sorry. I have apparently reached my limit of photos! Who knew?I'm using the mobile site on my iPhone. All I have to do is - top right hand corner there are 3 dots - 2 options come up, Attach Image or Cancel.
Attach Image - Take Photo or Photo Library -
Photo Library - asks for accsess to your library - find the photo you wish to add - add - it may ask to resize the image - say yes - it uploads.
Hope that helps.