Hi,
Well, I am an old school guy mostly using a computer to go on internet 

The 'Attachments' option below requires a file name + location, which is I believe different than how a smartphone manages files internally I believe? 
But if you can display the url name of your pictures, you can past it between this 
tag code (without the _ symbol) ->
[_
img]https://url of your picture 
[_
/img]