...
Tick this checkbox to delete any existing release assets with the same name before uploading the new updated assets.
When To Run
You can specify when the build event handler runs by linking it to a Build Event on the When To Run tab.
...
An error result will be returned if a release with a matching tag name is not found. Tick this option to ignore these errors, only logging a warning to the build log.
Fail build on error
Tick this to fail the build if the operation returns an error or failure. This is only available if Wait for result is ticked.
...