John you cannot insert a picture by typing a URL path to an image on your Mac.
The dialog box to add attachments has:
- buttonsto select one or more file, then
- another button to upload them, and
- it should confirm at the bottom which ones uploaded with the file sizes.
- then the button at the bottom “close this window”:::
Note the file size must be under 200kB or it won’t load.
One way to do that in OS X is open the image the way you like (Preview will do) and take a screenshot of the portion you want (cmd-shift-4).
Open the screenshot in Preview and sekect Save As under the file menu - this has a slider where you can reduce the jpeg quality significantly which also makes the file a LOT smaller. Once under 200kB, save that and upload as per above.
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