I am trying to add a simple picture from my hard drive to the side bar via the Image Widget (Jetpack). Here are the steps I'm taking:
1. Make sure image is in public folder of my dropbox account.
2. Click "Share Link" in the Dropbox sub-menu.
3. Open the widget in WordPress (.org), and paste the resulting URL into the Image URL box.
4. Click "Save"
To my way of thinking, I should then be looking at a picture on the sidebar - but nothing is showing up, despite a valid URL that works when I put it into a browser window.