Unity Android I have written .csv into application.persistantdatapath and i cannot upload it from android

Question

I have built a game that receives input from player and writes it as .csv in application persistent data path, and uploads that written file from application persistent data path to Firebase storage; it works fine in Editor, but doesn't work in android APK.

I have found that android is an archive so it does not let system.io find the file. so I am using www. and still cannot find a way. Help please. Thank you very much in Advance :)