Step 4. Add Trigger

If you complete "Step 3: Create CreateThumbnailDemo Function and Test", and the test result meets the expectation, you can add COS configurations so that COS can publish events to SCF and call the function.

1) In the details page of the CreateThumbnailDemo function you just created, select the Triggering Method tab, and click Add trigger mode.

2) Select COS trigger for the trigger method, mybucket created in Step 1: Prepare COS Bucket for COS Bucket, File Upload for the event type, and then click Save.

In this way, you have completed all steps. You can test the configuration by following the steps below:

1. Go to the COS Console, select mybucket, upload a .jpg or .png picture, and check whether a file with the same name exists in mybucketresized after a period of time.
2. You can monitor the function activities in the Serverless Cloud Function Console, and select Logs to check the logs in which the calling of the function is recorded.