I don’t seem to have a way to make sure the alt text I add to photos gets carried over to all my areas for posting. I think I’m going to start putting the description in the body of the post. I’ve seen other people do that, as well as add the alt text to the actual photos, and it feels acceptable to me. This is especially true since alt text is only read out when a screen reader is turned on, and there are lots of people with low vision needing access to the content of photos.