So if you find yourself wanting to post images to your page and don't want them hosted on a public site then use this method to host your own! We use it for all our graphics on our profile.
First upload all the graphics and photos you want to Google Photos!
Then select the the photo or graphic you want and click the share button. From there choose to "Create A Link." Make sure you copy the link
Next go to This Website and paste the URL in the field. This converts to a usable image link.
Optionally you can shorten the URL with bitly.
So now you can host as many images as you want and not have to worry about the image ever disappearing. This is especially better than just linking to whatever you find on a google search. For example: Friends Only Blog Posts with pictures you don't want strangers seeing (pics of your family / kids / etc. etc. You get the idea).
<img style="object-fit: contain;" src="https://example.com/img.jpg">