Db1 add listener in new ui

im making a new chat app but have problem with the new cloud varible. can you plz tell the new blocks similarity with the old ui

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this block in the new ui
thunk

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Use this instead
image

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But cannot use variables that have not been initialized? !

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I did not understand. Can you please make it clearer.

As far as i know.
Dynamic variabeles don’t support that.