360° photos longer than 10sec in photoshow

As said in title in the app if you make a photoshow and insert an 360° photo you can only extend the timeframe to 10 seconds, is there a possibilty to have a longer timeframe to set keyframes etc. I know you can insert the same photo twice and have theoreticly 20sec, but if you make a keyframe in the first you cannot make a clean switch to the 2nd photo