Thanks to your comment I spent a few moments figuring out how to do that. It's not perfect but it's a huge improvement. I've had camera access off but photo ac

Thanks to your comment I spent a few moments figuring out how to do that. It's not perfect but it's a huge improvement. I've had camera access off but photo access on. I turned it off and then used photos to select pics and then pick share and choose the app. For FB messenger it starts a new thread which works great. If you choose a single user it will add to that thread. For the main FB app it starts a new post. I'm not sure there is a way to add photos to comments or events or albums without photo access.