Hi creativemedia,
I’d love to help here. Let’s break this down to get a clearer picture of what’s going on.
The “choose existing image” dropdown doesn’t reflect uploads through file manager
I’m not quite sure I get what you mean here. Could you take a screenshot of this so I can get a better idea?
but selecting one from the menu does work, but not if you browse for a new one.
I’m not entirely sure what you mean here. Could you explain for me?
Also I am unable to upload through the edit page, using the Structure plugin.
In general with a third-party add-on, you’ll want to get some help from the developers who make it, but I suspect this will be taken care of if we get your other issues taken care of. Let’s work on those and see if it wraps up the trouble with Structure.