How to give write access to FX File Explorer?

by reddxue

I have a Xiaomi 4k TV stick. My objective is to be able to save video files from an app into external storage linked via OTG cable. So I am trying to use a download manager to change the default save location whenever a file is downloaded, but this requires write-access which can be given via FX File Explorer. I tried to give this write-access on the Media Device using FX File Explorer, but I get stuck on this screen and no one seems to have a solution on the internet. The usual permissions in the general app settings are all on. Any ideas how I can proceed with write access? Thanks!

Forestlandep