image in thread
Click on the "Reply to thread" link to open the "Reply" window . . .
At the top of that window is a menu bar which starts (on the left end) with "B I U . . ."
At the extreem right end of that menu bar are three symbols with yellow boxes . . .
The first inserts images from the web . . .
The second inserts images from your computer . . .
The third inserts images from your gallery !!!
Click the third one and do what it tell you to do . . .