Existing MP3, htm, and wav files

[Arjay7]

Disclaimer:  I'm a new user.  I'm sure this has come up before, but I can't find an answer.  How do I play above files that are already on my android smartphone?  All I want to do is play existing files with the ability to rewind parts I want to review, and this program was recommended.  I don't see where I launch them.  What am I missing?  I can play the files on an HTML Viewer.  Thanks

[Patrick Julien]

There is no place currently to launch manual files in listen up. This
is because i never had the courage to do those UIs

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