Here's one way:
1. Click on "Switch to Full Screen Reply"
2. Click on "File Manager"
3. Select and click on "Upload"
4. When done click OK.
5. "Submit" message.
That looks easy enough. However, when I tried to follow those steps a message popped up saying that my image exceeded the size allowed (3.91MB). Well, it doesn't, by a country mile: it's only 161KB. I must have missed something...
