5013: the default card image must be a PNG
the default card image must be a PNG
the default card image must be a PNG. This is an HTTP 422: the request parsed but a value is not acceptable.
Troubleshooting
Section titled “Troubleshooting”- Check the file against the documented size and format limits for this field.
- For a source URL, confirm it is reachable, returns the declared content type, and is not behind auth.