The pictures are only saved on your device. Please check if you have the camera set up correctly, and also allow the permissions for using the storage on your device.
When you first access the app, it asks you for camera permission. If you say “Don’t Allow”, the camera feature is not enabled. You technically do not have to allow the app to access the camera, but roughly half of the app’s activities do indeed make use of the camera. Your child will be missing out on a significant and fun portion of the app’s features.
You probably have the camera turned off on your device. To fix this problem, go to your device’s “Settings” -> “Privacy” -> “Camera” ->, find the Speech Blubs app on the list, and tap the button on the right to enable camera access.