You can do it either from TapaTalk or directly from Safari if your iOS is up to date.
When composing a reply in Safari, click the Manage Attachments button under the typing window.
In the new window that opens, click the Choose File button and proceed accordingly.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.