How Can a Slack App Be Configured to React to Any Message Sent to It?

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has anyone figured out how to make a Slack App (not bot account) react to any message sent to it? I can use it for API requests, etc. but when trying to trigger the workflow on any direct message to the Slack app, I can only select direct messages of single users that have previously interacted with the bot of the app.
Ideally I’d set the trigger so each new direct message to the bot would trigger the workflow. I have done something similar before with a standard user that acts as a bot, but would like to make use of slack app features.

can you help here?

Hey Joscha, I’m not sure how to do this for any message sent to it, as channel + timestamp are both required fields in order to react to a message (reactions.add method | Slack).

But for direct messages, you can use the New Direct Message trigger, and have it react to the direct message using the channel and event_ts of the message.

It sounds like Joscha just wants a Slack trigger that emits on any DM

New Direct Message should work for your use case

Apologies for the late reply, was ill and thank you all for your answers.
New Direct Message (the instant variant is what I am after) is only available for slack users, it seems, not Slack Apps with an attached bot. Am I holding it wrong?