#12 Environment.getExternalStorageDirectory() is deprecated for API Levels 29 and over

Usage of `Environment.getExternalStorageDirectory()` is deprecated for API Levels 29 and over. Must substitute for some other external storage access method like `Context.getExternalFilesDir(String)`, `MediaStore`, or `Intent.ACTION_OPEN_DOCUMENT`. Luckily, this method is only used to read/write the consent form to device storage, so there are not many occurrences of it across the codebase. [More info here](https://developer.android.com/reference/android/os/Environment#getExternalStorageDirectory()).