What I have tried:
1. make sure my Windows 10 Pro has the latest update, ufile has the latest update.
2. Edge is working properly
3. Set Edge as default browser, uninstaller Internet Explorer 11 (both are unnecessary based on the test on my VM, though)
4. removed all other Edge profiles, only leave the default profile, not signed on
5. removed all extensions in Edge
6. Clear ALL cache in Edge
7. Reset Edge settings to default
So my Edge is practically like fresh
8. make sure I don't have VPN, and internet connect is working
* make sure Edge works fine, close and restart ufile app, try again.
* Restart my laptop, and try again.
Nothing works so far.