When the navigation button is activated the menu is displayed and focus is redirected to the menu items. Focus can be set on any element (VO is guessing at the focus location). When the initial element receiving focus after activating a screen or a pop up does not convey proper information, VO users who cannot see the screen may be confused what changed on the screen and will be forced to navigate away to understand the content. In addition, since the menu is placed at the end of the screen, when swiping back, VO users start navigating through the footer elements of the main screen. This may be confusing.
Ensure that when the menu is displayed an element consistently receives focus. The best solution is to provide a back button when the menu is displayed (to quickly navigate away from the menu) and set focus on that (this behavior is present in the Android app).