Tech question about putting pics in threads with phone

[CarlosCarson27]

When looking at site on phone,
I only know to use attachment thing.
And so it only shows up as smaller attachment.
If I take a picture with phone, it won't load in attachment part.
Only screen shots from phone seem to load in attachment part.
But ultimately I'm asking, how on phone do I just put a picture to be visible normally. Whether photo or screen shot.