Some features in SharePoint 2013 require the use of ActiveX controls. This creates a limit on browsers that do not support ActiveX. Currently, only 32-bit versions of Internet Explorer support this feature. That is, for the document library Explorer open requires 32-bit IE open, if you are a 64-bit machine, it is possible to install two versions of IE, 32-bit and 64-bit respectively. Please use the 32-bit version to open. Also note that some SharePoint features only support IE. Please refer to the official documentation for details.
https://technet.microsoft.com/zh-CN/library/cc263526 (v=office.15). aspx
1. The Explorer button is as follows, you can drag and drop folders and files, consistent with using local resource manager.
2. Unable to drag folder in drag mode
3. Drag and drop multiple documents in drag mode
4. Drag and drop the batch upload document, a progress bar is shown below
Multiple forms of SharePoint 2013 document uploads