Saw this post with similar errors a week ago, so I don't seem to be alone in this.

Over about the last 2 weeks, I frequently encounter error code 500 messages when trying to add pictures.

It is intermittent, but will sometimes persist for a while. It doesn't seem to be the photos, because if I keep at it, they will eventually upload and post properly. Sometimes it's just one or two errors, and this morning I eventually took a break for 15 minutes after repeated attempts frustrated me, and then some pics would upload fine, while others still gave errors.

I saw it's not the same error every time either. I made sure to grab these 2, but there may be more, maybe an error 27 also, I thought I saw a 27 anyway while clicking too fast.