Why can't I download a photo, or large e-mail, using my e-mail app?

[OkechukwuOfili]

I would like to know why can't I download a photo, or large e-mail, using my e-mail app?

 

[davidblake]

Well, can you tell us which email app you are using ? i.e. are you trying to download the pictures by using gmail app or the stock email app installed over your device ??