Dialog on Trigger on new record

Am I correct that a Dialog will not work (cloud version) when creating a new record.  Example dialog below in case there is something wrong with it.

let title := "Serial and/or Bundle Required";
let message := "Does this new record need it's Serial Number logged? 
If so is it part of a Kit/Bundle?";
let answerOptions := ["Yes", "Both", "Ignore"];
if dialog(title, message, answerOptions) = "Yes" then
    SERIALIZE = true;
    if dialog(title, message, answerOptions) = "Both" then
        SERIALIZE = true;
        'IS BUNDLE' = true;
        if dialog(title, message, answerOptions) = "Ignore" then
            SERIALIZE = false;
            'IS BUNDLE' = false
        end
    end
end