Post the comment to the asset path. For instance, to post a comment to the mountain picture that is part of the Geometrixx samples, POST to: http://localhost:4502/content/dam/geometrixx-outdoors/activities/snowboarding/PDP_1_c05.jpg.
Use the following request attributes:
2. path: /content/dam/geometrixx-outdoors/activities/snowboarding/PDP_1_c05.jpg
3. message: Posting a comment programmatically....
This results in a new Granite comment on the asset