How Could I add a video created by the customer?

Summary:

My customer needs to upload a video for requesters users while performing the requisition self service process, the video has been created using MP4. The video need to be uploading into the Guided journey.

However, we don't know how to make the video task URL works
This is the video file stored in my laptop.

Content (please ensure you mask any confidential information):

Under Procurement > Application Extensions > Guided Journeys > Selection Journey > New Task > Video, Media ULR

What is the correct Task URL for the video?

Using the Implementing and Using Journeys 25B manual, the instructions provided are not well described.