定价
免费额度是 10G，然后 A 类每月一百万，B 类操作每月 1000 万，完全足够了。
Class A operations
Class A Operations include ListBuckets, PutBucket, ListObjects, PutObject, CopyObject, CompleteMultipartUpload, CreateMultipartUpload, LifecycleStorageTierTransition, ListMultipartUploads, UploadPart, UploadPartCopy, ListParts, PutBucketEncryption, PutBucketCors and PutBucketLifecycleConfiguration.
Class B operations
Class B Operations include HeadBucket, HeadObject, GetObject, UsageSummary, GetBucketEncryption, GetBucketLocation, GetBucketCors and GetBucketLifecycleConfiguration.
创建存储桶
S3 接口
参考文档 Authentication | Cloudflare R2 docs
在 Cloudflare | Web Performance & Security 创建一个 api，选择合适的权限和存储桶。
创建了 api 令牌之后，就会有为 S3 客户端使用以下凭据：
- 访问密钥 ID
- 机要访问密钥
- endpoint 注意这些信息不会再次显示，所以记得保存。
参考 obsidian 插件 remotely save 的设置
