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So no reason to leave this open.Good luck getting the op who is probably the dev to answer to this. He only posted this one thread and never came back. Looks like it's no longer in the play store. Even if you could find the apk, the app came out in 2016. A 2016 app that had not been updated to the latest Android os, probably would not work, or you could get lots of crashes and glitches.
If the op dies not respond, I would look else where for a music app.
DannyYeah, BTW, pdf file format is not the ideal format for sending in a text message and that is why you are experiencing such issues...
Convert your files to jpg files and tada!
Now you can send them in text messages no matter what folder you have them in.