Im not trying to build an assembly. I am using the “webhook - new webhook received” trigger from the catalog on an automation.
Normally after you add it to the automation it will give the “webhook url” dialog and pressing ok copies the url to your clipboard. it then waits for the webhook to be called.
When i click ok, it jumps straight to the trigger screen like it was called. you never get to actually set it up and map fields.
Ah. I just tried it on your system and it worked ok for me. Try a different browser. Either something is wrong with the browser or browser extensions might be interfering.