Dumb question - how do you easily insert a photo/image inline with writing text in a post?

Hmmmmm….

 

 

Just upload your jpgs to https://imgbox.com/
Once they’re uploaded there are some boxes you need to check. Family Safe content, Thumbnail size ( use a large one-and note that there are rectangle options lower-called re-size). You can ignore the other 2 boxes.
Hit the start upload button. Wait a few seconds. You’ll see a new screen. copy/paste the Links Only address. Paste it in the Audiogon window and wait a few seconds. Do them one at a time or it doesn't work well.

 

So is possible to post images from my iCloud using iPhone 13Pro ?

Now that these technicalities are being addressed, can somebody explain how you insert a youtube link so that the image appears in the post, rather than just the standard internet link.  When I use the paperclip icon I just get the link, and when I use the picture icon, nothing happens.

For YouTube, you have to use the last icon on the right, the Source icon.
It will display text only but you can see in when you hit "preview". 
Hopefully, you won't have the same problem I have when shrinks the size of the video.

All the best,
Nonoise