moved to Animate CC forum
We need more information like how the holding screen is animated, how you want it to look when it is tweening to the slide, for example, do you want the screen to move off screen and show the other slide below?
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You can, for example, have a timeline with 61 frames.
Your loop animation plays from 2 to 31.
Your transition animation plays from 31 to 61.
On frame 1, you set a variable called 'frame' to 2, like so: var frame:int = 2.
On the frame 31, you have a gotoAndPlay(frame) function. So your animation will be in loop.
Then, in any moment, with a key press or mouse click, you set your variable 'frame' to 32, so when the playhead reaches the frame 31 your transition animation will be shown.
Remember to put a stop() function on frame 61.
If you have any questions or need an example of this built, please let me know.