Make sure that Telegram and the game have access to the camera.
If everything is fine, but you still can't add a receipt - take a picture and upload it from gallery. You can do that too :)
Check your balance! It's probably just the animation that hasn't showed.
If the lootbox is opened for Stars - try opening it once again.
Your friend needs to start the bot for the first time using your link, and actually start playing.
If you've done everything right and the bonus is still not credited - report this in the feedback bot.
Make sure that you don't have blanks or cyrillic symbols typed. It's better to enter the email manually, or type it in the notes app and paste in the game.
You're always welcome to report any issues in our feedback bot.