@dwolden When you try to post a photo, it can take a few minutes to download. Underneath the box, you’ll see the Add Photos prompt. When you click there it should open to the window where you can ‘drop or download’ a photo

Click the prompt and you’ll see the menu where you can download a photo from ‘your library’, take a photo or download a file. Once you make your choice you’ll see a line under the photo where it’s downloading. Sometimes an X will appear if the photo takes too long to load. Or, if it’s too large.
You have to wait until it is completely finished loading before clicking Reply. You’ll see a green check mark when it’s been successful.
What is happening when you try to do this?