Double stick tape.
When I include a picture I simply select the paper clip icon from the area to the right of the "fonts" box. That brings up a manage attachments box that you can select the picture from on your computer. You then upload the file or files. The picture will be attached and also show in your message.
Retired electronic technician (45 years in the field)
2017 Greyhawk 29W
solar & many other mods
wife (maybe I should have given her top billing)