Windows 10: Files from the phone are not displayed on Windows?

Hello,
i have recently updated my phone, but i noticed that when i am in Handy Explorer there is a folder called Whatsapp, but when i access the phone via USB in Windows Explorer this folder does not appear, even if i create a new folder in Handy Explorer it is not displayed in Windows Explorer. Also after disconnecting the cable from/to both devices, and also after restarting the PC the same problem.
Only after I restarted the phone (Android 8) it seems to work again. Had to restart my mobile phone 2 times now because the error came back. The strange thing is that if I get this error and I can't see new folders or files in Windows Explorer, and I try to drag music or other stuff from the phone to the PC or the other way around, it works. So no connection problem or something like that.
What can be the reason for this?

:)

 

Windows Phone users Clubhouse

I think I'll put a list of people's favourite apps in the OP, starting with my own until I get some suggestions, but you can take a look at the Windows Phone app store at the top apps to see what's popular http://www.windowsphone.com/en-us/store

You are both now added, welcome! *Toast :toast:

 

Supported phones for Windows 10 Mobile Insider Preview


Your list confirms my phone is eligible, Lumia 521. The windows Insider App fails after ~ 15 seconds, restores data and gives me error 80073cf9. I trouble shot this and went thru all the steps mentioned on several websites including MS without any luck. Short of a hard reset, this is where I am now. Suggestions appreciated.

 

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When my phone fails to upgrade I just keep trying. One upgrade took 3 or 4 tries.