activities
latest
false
UiPath logo, featuring letters U and I in white

Workflow Activities

Last updated Oct 21, 2025

On App Trigger

The On App Trigger starts the process execution as a response to an API event. It leverages Event Triggers from Integration Service, Microsoft 365, Google Workspace, or System activity packages.
Note: The On App Trigger event corresponds to the Message Start Event element in BPMN.

Use On App Trigger when developing automations triggered by external events, such as email actions, items added to queues, employees created in Workday, or records created in SAP.



To start the process any time an external event occurs:
  1. Right-click on the Manual Trigger or the On a Schedule canvas element.
  2. Select Change Type.
  3. Select On App Trigger.
  4. Right-click on the On App Trigger canvas element and select Set trigger. This opens the list of all available API events. If the API event you selected is not installed on your device, you must wait until the installation of the container package completes.
  5. Once selected, the On App Trigger is replaced with the corresponding activity.
  6. In the properties panel of the API event, provide the values for the conditions under which the process must start executing.
    For example, if you selected the File Updated trigger, you would need to provide values for the File Updated activity in the Microsoft Office365 activity pack.

Was this page helpful?

Get The Help You Need
Learning RPA - Automation Courses
UiPath Community Forum
Uipath Logo
Trust and Security
© 2005-2025 UiPath. All rights reserved.