storage_policy.relay set to true, use Upload file chunk;upload_urls, there should be only one element in upload_urls. The request is similar to Upload file chunk, except:chunk, e.g. http://slavecloudreve.com:5213/api/v4/slave/upload/f1dd2c8c-0c51-475b-a086-b338ae1d8109?chunk=2Authorization shoud be the value of credential in upload session, e.g. Bearer Cr sBnnQ3rZ-UBr7d8ohKpUFtsQc8OMLuWwn1VhuJtdc5k=:1749623351storage_policy.relay set to true, you don't need to finish upload, it's automatically finished after last chunk uploaded.