Proceed as follows:

1. Open the page Onboardings.
2. Click the name or one of the phases of an onboarding process. The Onboarding page is displayed.
3. Activate the Attachments tab.
4. Click the button Add Attachment. The input form Attachment is displayed.
5. Click the area File and select the file that you want to upload.
6. You can add a description.
7. Click the button Add to save all changes.