have you read this topic?
I don’t know anything about Qiniu Cloud or if their S3 storage is supported, but you will need an access key and token (I believe they are generated in your Qinui Cloud console). If it’s possible, your app.yml file settings should probably look something like this example:
## S3 storage
DISCOURSE_USE_S3: true
DISCOURSE_S3_REGION: whatever
DISCOURSE_S3_ENDPOINT: http://s3-ap-southeast-1.qiniucs.com
DISCOURSE_S3_ACCESS_KEY_ID: *************
DISCOURSE_S3_SECRET_ACCESS_KEY: *****************
DISCOURSE_S3_CDN_URL: http://qiniu.pengfeima.cn
DISCOURSE_S3_BUCKET: qiniu-s3
DISCOURSE_S3_BACKUP_BUCKET: qiniu-s3/backups
DISCOURSE_BACKUP_LOCATION: s3