delete data from cloud db

I am trying to delete the data from cloud db but it's not working, pls help me
also, can i save images on cloud db.

See the blocks image below:

Pressing Button3 will clear the tag "image" from the Cloud DB

Pressing Button1 will save the image (using the full and absolute path to the image) to a tag called "image" in the cloudDB

Pressing Button2 will retrieve the image file in the tag "image" and display it in an image component. A new file is created in the folder AppInventorBinaries in your default location - ASD/files or root of the sdcard card (depends on Android version)