Why does my 𝙲𝐚𝐬𝐡 𝐀𝐩𝐩 keep saying transfer failed?

https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC
https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC
https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC
https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC
https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC
https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC
https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC
https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC
https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC
https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC

https://support.google.com/youtubekids/thread/340418119?hl=en&sjid=10726494108989117625-NC

Why does my 𝙲𝐚𝐬𝐡 𝐀𝐩𝐩 keep saying transfer failed?