ExportedAsset
constructor(mimetype: String, size: Long, name: String? = null, otrKey: ByteArr, sha256: ByteArr, assetId: String, assetToken: String? = null, assetDomain: String? = null, encryption: ExportedEncryptionAlgorithm? = null, metaData: ExportedAsset.MetaData<*>? = null, unknownFields: Map<Int, UnknownField> = emptyMap())