The html5 code for a play button doesn't trigger animation of 50 png file frames
I have 50 png file frames that I created an animation with in Photoshop. I'd like to create a play button to trigger these 50 png file frames to play in a gif file. I've imported the 50 png files into Animate and turned all 50 png files into moive clip symbols and placed them in 50 frames on an Animate time line in their animation order. I used the html 5 action code to stop the 50 frames at frame1 and to stop them from looping around at frame 50. In the test these html 5 codes worked fine. But, when I created a play button on the first frame to trigger the animation to start on the second frame the html 5 code didn't work. In fact this html 5 play button code overrode the html 5 action codes to stop on the first frame and stop on the 50th frame. When the html5 play button code is added the test shows all frames go back to endlessly looping in the test until I delete the html5 play button trigger code. Below is the Compiler Error I get everytime I code in a play button to trigger the 50 movie clip frames to start the animaton on frame 2...

Is it possible to create and export a play button triggered gif file in Adobe Animate with 50 png files with which an animation was created on a timeline in Adobe Photoshop?