It isn’t clear to me how I’m supposed to test my Twitter cards on mobile devices before being approved and going live with them.
I see that the card implementation flow is this:
 Test cards on desktop, Android (native browser and official app) and iPhone (native browser and official app)
 Submit application
 Go live!
But the preview tool is only useful for testing desktop and (I guess!?) the native browsers on Android and iPhone
[Q1] How can I test the cards on the official Twitter app for Andorid and iPhone?
[Q2] Is the preview tool used for testing how the cards will appear on iPhone and Android native browsers?
Please help me with this because the only was I see to do it is if the cards go live and I test them that way but of course they can’t go live before testing and approval!
Thanks a lot.