Cannot post picture in blog

I can no longer post pictures in my blog.

Things were going fine until three days ago. I had been making lots of new
blog posts of pictures with short captions/descriptions.
Check them out: https://www.momentswithbaxter.com.

Then something mysteriously changed, and now I can’t figure out how to post a new
picture. Before, when I clicked on the “new post” tab, there was an icon that would lead me to selecting/downloading a picture.

The icon is now gone.

I have since cleared the cache and cookies, but this did not bring the missing picture icon back.

I would appreciate it if you could help get me back on track.