Waypoint Mission using IOS

Waypoint Actions will be ignored when the “Mission Setting” “Path Mode” is set to “Curverd Turns”, “Path Mode” has to be set to “Straight Lines”.

Waypoint Actions always work for the first and last waypoint in a mission regardless what “Path Mode” is chosen.

That seems strange, it would either imply you have “Path Mode” set to “Straight Lines” or this happens at the first and/or last waypoint or you have AFC (Auto Focus Continuous) enabled.
AFC can sometimes prevent a photo from being taken (when the refocus and Take Photo action are triggered at exactly the same time).

Here you will find instructions on how to share a waypoint mission: