To find out what images you have stored on MIT's CloudDB , get a List of Tags. All images are stored using a Tag, either as separate Tags or as items in a List stored as a Tag.
MIT's CloudDB is a Redis database maintained on MIT's server or your own Redis server. It is a Cloud database. Firebase is a Cloud database (maintained on Google's server.). Google's Blaze plan is described here
https://firebase.google.com/pricing/?hl=vi .
The CloudDB does not have pricing plans. It is free when you use the default option for experimentation or small databases. If you are develop commercially using the MIT Cloud DB, you MUST use your own Redis database server. The cost is the cost of maintaining your own server or subscribing to a third party service for hosting your database. The server MIT uses gets overloaded with too many users occasionally and throws an error message. Also, the server occasionally needs resetting and no one monitors the server 24/7 so it sometimes is not available (usually on weekends). The free data base's popularity is a cause for overloading the service often..too many users sometimes.
The CloudDB component is nearly identical to the FirebaseDB control in the way works. The CloudDB App Inventor 2 control works with a Redis server.
See these options for establishing your own server (either on your own equipment or hosted elsewhere)
Regards,
Steve