I would like to elicit a slot from a user and send an Echo Button animation at the same time, to provide a visual cue. However, it looks I can't send both a Dialog and GadgetController directive together, according to this error:
No other directives are allowed to be specified with a Dialog directive.
I considered sending one of them separately via the Progressive Response API but that only supports the VoicePlayer.Speak directive. Will either of these options be supported at some point in the future?