Builder
open fun Builder(@Nullable senderId: String, @Nullable fileName: String, @Nullable channelUrl: String, @Nullable url: String, @Nullable plainUrl: String, @Nullable requestId: String, @Nullable mimeType: String, @Nullable senderNickname: String, createdAt: Long, messageId: Long, @Nullable channelType: ChannelType, @Nullable themeMode: SendbirdUIKit.ThemeMode, isDeletableMessage: Boolean)