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]