Feature request: better folder picker when scheduling the auto export feature

[Brian5647]

Currently when you want to automate the export, it does not show any files and also does not use the android native file/location picker. (It does do this when asking for the permission to the folder) it would be better to use the android native as then you support the option to store the files automatically on a webserver or another location within the android file system.

Currently only the downloads folder is able to be used