When you post or reply, you see an Attachments option to Upload File. Click on it and it opens a Browse option (I usually pull off my desktop) and an upload option.
Then it shows the Attachments and to the right of that a box "Create link in message" I'll hit the "enter" key first to bring the cursor to the left side
[cursor] here then click on that "Create link in message"
Lets see here [test]
[attachment 114051 DetectorFamily.jpg]
I got "attachment 114051 DetectorFamily.jpg" ....... DetectorFamily was the name of the pic and in jpg format.
Like already mentioned in a reply, you don't want a large file size.
Can resize the file, or like me most times will set the camera to low quality email size settings which will create a smaller file compared to a higher quality photo.
Then when you hit the Post message - well, lets see here
![Unsure :unsure: :unsure:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
K - now I just brought this back up (edit) because I ended up with the pic twice as I tried the brackets [ ] with the file name after the pic was already posted. Guess it got seen twice, so now removing the brackets [ ] replacing with " " and will hit Save Changes option at the bottom.
K - again, lets see