When I select the first listed item at the top of the binder and click the add-item button on the toolbar, the new document is added just below the selected document and all the top level folders in the binder are collapsed. It’s very annoying since I would have to re-expand those top level folders that were previously opened, one at a time. But this problem does not happen if the new added document is automatically placed at the very bottom of the binder. I’ve included images to show this in action.
In the binder select the top-most folder and hold SHIFT and then select the bottom folder. This should select all the top level folders in your binder. > Next go to the View menu > Select Outline > Select Expand All
While this wouldn’t address the root of the problem in your report, it will save you the trouble of having to re-expand all the folders.