Can't read .txt file with HTML Viewer on New phone

[Jfossy]

Since upgrading to my new phone, Moto G4 Plus running Android 6.0.1, I cannot open a .txt file from my Dropbox using the built in HTML Viewer.  My previous phone was running Lollipop.

https://www.dropbox.com/s/ezap5v0cos0wau8/Screenshot_20170212-090528.png?dl=0

I can open them with other apps from Dropbox including the Dropbox Text Editor or the App Docs, but for my purposes, the HTML viewer is perfect for my what I need.  The Dropbox Text Editor double spaces everything and Docs converts it and then saves in Google Drive.  I guess I can look for another app, but I would prefer not too.

[Jfossy · Accepted solution]

I found the solution.  BTW Motorolo support is a joke.

Go to Settings - Apps.  Click on the 3 vertical dots on the upper right  and select Show System

Scroll down to HTML Viewer, Click on Permissions, turn on permissions for Storage.

Thanks Rich for letting me know that it is a system app.