消息段的附件：图片/文件/音视频的资源引用

Properties

data?

readonly optional data?: Uint8Array<ArrayBufferLike>

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file?

readonly optional file?: string

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id?

readonly optional id?: string

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mime?

readonly optional mime?: string

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name?

readonly optional name?: string

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size?

readonly optional size?: number

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url?

readonly optional url?: string