The modified date of file is not updated when a file is modified.
On synology server the modified date appears but not in windows file explorer.
See capture
Hi~ @TCH ,
The Synology WebDAV server cannot update the time of a file with a standard request.
Therefore, by default, only the upload time of the file is displayed.
However, it is possible to modify the file time via “win32 attributes” (a feature of Microsoft webdav).
Therefore, you will see the updated modification time in WebDAV, but not in Synology’s File Station or other protocols.