Hit the Go Advanced button at the bottom of the message box. The next page will have a box that says Additional Options. Select Manage Attachments. A small window will open. Choose the file and upload it. Click preview if you want to look at it first. Sometimes the pics are on their side, I do not know why.
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.
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Jim
Retired electronic technician (45 years in the field)
2017 Greyhawk 29W (solar & many other mods)
wife (maybe I should have given her top billing)