Kodi does not see all folders

Hi,

When I click add video files, it opens a dialog for folder selection. However, it does not see the folder stored video files. e.g. I have a folder “Download” on E drive, but it does not show up when I browse E drive, other folders have no problem to show up. What’s wrong with this? It happens on Kodi version 15, 16 and 17. I had fresh installation several times, no change. If I manually type “E:\Download”, it works on this way. I have been living for that for year but now I want to know why.

Thanks