!!! If something is wrong and you suspect corrupted data, reinstalling may not work as Android backs up and restores app states every time. Go to your phone settings, Apps, Folder Player, Storage, and tap "Clean Data" !!!
As mentioned in the description, playback for these is supported only if hardware supports it. Folder Player does not have software decoder and relies on Android OS for playback. If it does not play, that means Android OS did not like it for some reason. Yes, it is possible to incorporate software decoders for all formats, but this would make the app unnecesserily bloated. Small apps is a good thing, right?
Your phone is a Unix machine, and it is perfectly capable of mounting external network drives and see files as if the were stored locally. Unfortunately, most mobile operators block your ability to do that, however, if you happen to gain root access, you can search for "cifs" on Google Play and install application that allows this function. If you uncover a better solution please let me know, and I will post it here for others.
I recommend going to "Menu" > "Battery Use" and add Folder Player in the list of exceptions.
If that does not help: Audio tracks, technically, played by the Android OS, not by Folder Player. Folder Player will pause playback if it receives a request from your phone, such as bluetooth "stop" command, OR some other app, issuing "stop" command to external players. If you notice that playback does not switch to "next" song, this probably means that service was "killed", please see question #5 below.
Every music app needs to run a service, otherwise music will not be able to play in the background. If you want to shut down the service, use Menu > Exit in the app. But if you want to save your battery, you don't need to do that as Folder Player does not use your battery if music is not playing. Also, every service like that must be represented as an icon in the notification bar. If you want to hide the icon, go to your phone Settings->Application Manager->"Folder Player" and uncheck "Show Notifications" (BUT see #12 below for side effects)
First of all, don't use "battery saver apps" and "automated task killers".
Android manages apps without additional help: these 3rd party apps just add glitches and completely useless, providing only "placebo" effect.
Another potential reason - some phone manufacturers activate extremely restrictive battery-saving modes, and kill everything that it considers "not active". I recommend going to "Menu" > "Battery Use" and add Folder Player in the list of exceptions.
Permission "read phone status and identity" is required to pause\restart playback after user picks up or hangs the phone. Yes, this permission also allows to read ID of the phone - obviously Folder Player does not need/use any of that. In addition, the player does not have "internet permission", so the app can't transfer anything online.
There is a support for similar functionality through the concept of "Tags". If you navigate to a track, in context menu you can associate song with a particular "tag". These tags are visible from the root, and can be played the same way as folders. Also, app supports m3u playlists which you create manually.
Google established a special process for enabling write access to external drives. It works via showing a very confusing system dialog,
which allows user to grant appropriate write permission to SD Card.
The way it works in Folder Player - when you start app for the first time, you should see a dialog to find your external card to enable write access,
after which you will see these SYSTEM screens (this dialog displayed by Google, not by Folder Player).
If you want to re-run this process, just uninstall and reinstall the app.
FolderPlayer does not implement this natively, however you can try this recommendation from Google to enable it. Cast your Android Audio from the Google Home app
FolderPlayer does not process the sound. It is just an interface to find a track to play, waiting for next track to start. During playback itself, FolderPlayer does virtually nothing, waiting for internal system Android media player to finish playback. If you hear any anomalies this should be a problem with the file itself, hardware/firmware of your phone, OR third party tools which may interfere with audio stream, such as equalizers.
Uncheck option "Don't keep activities" in the developer options in the phone settings.
If you disabled notification from the app you may not see controls on the lock screen.
Make sure USB stick (or adapter) supports USB OTG specification.
Go to "Menu" > "Battery Use" and add Folder Player in the list of exceptions.
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