Access mp3 player files using an android

I have one if these mp3 players and no computer. I’m trying to use my android phone to access the files on it. I have an OTG compatible phone but can’t find a file manager that will read it. Thanks ahead of time for any help

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You need to get an otg file application that defaults as fat32 format

Is your firmware ver. 1.14. Atg has it locked down.