base on https://docs.ucloud.cn/api-docs/ufile-api/
register the Xujif\UcloudUfileStorage\UfileServiceProvider::class; in your app configuration file:
'providers' => [
// Other service providers...
Xujif\UcloudUfileStorage\UfileServiceProvider::class,
],config
[
'ucloud-ufile'=>[
'bucket'=>'xxx',
'public_key'=>'xxx',
'secret_key'=>'xxx',
'suffix'=>'',
'prefix'=>'',
]
]