Can't Download App in F-Droid

Device OS and version: Android Nougat 7.0
Device model/manufacturer: Evercoss U6
F-Droid version (in the About screen): 1.5.1
F-Droid privileged extension version (if installed): -

What did you do? (clear steps if possible)

I try download app. I click the app description and click download button. Only loading is showed. No notification in notification bar. When I click back button, and open the app description again, no loading, and no notification again.

When I try download app without opening the description, I have "downloading" message on the side of the name of the app but nothing in notification bar. But when I open the description and press back again. No download and no notification in the notification bar.

What did you expect to see?

F-Droid can download app. Before I change my phone to Evercoss U6 with Android Nougat, I can used F-Droid in Advan i4D with Android Lollipop without problem.

What did you see instead?

The app isn't installed. But when I press download button over and over again, I can install the app but I can't see the download process, and notification.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information