A day or so before the recent Security Certificate glitch I noted I was no longer able to embed photos into a post. It seems this has been an issue for folks for some time depending on how/where they store their images. It took me a while to figure out how to do it using my Microsoft OneDrive cloud storage.
I open the image on OneDrive & choose the 'embed' feature. This brings up a side panel with some options including the ability to size the image before copying the link. It also has an option to include html tags which I bypass. Copy the link, paste into post using the Insert Image icon (From URL option). I also need to clear the checkbox under the URL bar in this. Worked great until recently. Now when I paste the link into the URL box, clear the checkmark below it & hit OK, all there is in the post is a blank....
Doesn't matter whether I use advanced reply with post preview or quick reply, no joy either way.
Before that I was able to use my Google cloud storage in a similar way. Now all I'm able to do is copy the link from OneDrive using the share option & the post shows only the hyperlink, not the photo. The link takes you to the photo via a new window.