Opening local files from modern file managers does not work

[SebiderSushi]

This issue seems analogous to another one that's already been resolved, so i'm going to just link to that one for now, you can read through it to get all the details: https://github.com/markusfisch/BinaryEye/issues/93

TL;DR: It's likely that the functionality itself is already implemented in Lightning and that simply removing the scheme="file" restrictions from all affected android.intent.action.VIEW intent-filters should resolve this issue. For more info, see this section from the android developer guide about intent-filters in times of content providers.