'I can't open a downloaded file with an input stream in Android Studio

I am successfully able to download a file, but when I try to open it, I get a file not found exception. I appear to be writing and accessing the same directory. I added the read and write permissions in the app's manifest file.

setDestinationInExternalPublicDir(Environment.DIRECTORY_DOCUMENTS, "fileName.txt")
.....
myInputStream = assets.open(Environment.DIRECTORY_DOCUMENTS + "/fileName.txt")


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