so I built and launched Alexa skill.
Now if I would like to do the same for Google Assistant, if I change platform in the Voiceflow I see all my custom and built-in intents disappear. So basically I need to rebuild all intents and slots?
This might be too late, but as my experiences, you should not switch between Alexa and Google for the same project. I recommend copy your project first and switch to another.
I’m not sure about what’s happen on your custom intents, but there seems no built-in intents for google, currently.