文件同步是数据通道组件的能力，目的是解决在网络较差场景下边端和云端大文件传输重传问题。例如，边缘节点部署在室外，使用4G或5G联网，因环境影响或设备位置移动，网络可能不稳定，此时节点需要上传视频文件到云端就需要断点续传功能。

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