This is possible to implement. We will implement it in the next update.
This isn’t possible unfortunately… Since cloudinary can be initialized with the provided credentials only once. So attempting to change the credentials and re-initialize would cause an error.
The block should be there. But There is actually a bug that causes some blocks to disappear from the workspace. Until fixed in the next update click anywhere in the block editor, type ‘open another screen’ and click enter. The block should be added to the workspace.