Use file bank.
Click Browse to choose your picture from Disc.
Enter Description, copy it to the memory buffer.
Minimize pop-up, enter description to the end your message.
Open pop-up, copy picture's URL provided to the memory buffer.
Click Image button
Paste URL from memory. When it asks for Description, leave it blank.
When the code is pasted to the end of your message, close File Bank's Pop-up.
Copy and Paste description between ][.
Replace "imgs" to "img".
It looks difficult overall. In practice, it takes 10 seconds.