我用[[WFCCIMService sharedWFCIMService] getConversationFiles:self.conversation fromUser:nil beforeMessageUid:0 order:FileRecordOrder_TIME_DESC count:50 success:^(NSArray<WFCCFileRecord > files) {
weakSelf.allFiles = files;
[weakSelf.tableView reloadData];
} error:^(int error_code) {
}]; 获取文件列表 为啥返回254
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