help)twikoo image cdn setting

[tipsyoncola]

I'm trying to use twikoo image cdn.
image_cdn_url : https://7bu.top
image_cdn_token: 'token'

I entered it like this, but the image cannot be uploaded due to the error code 403 problem.
I also tried setting the environment variable IMAGE_CDN_TOKEN for vercel, but it failed.
I don't know how to solve it. Your help would be greatly appreciated.