Android File.listFiles() not working for some directories

Question

I have read/write/management permissions added to my manifest. Permissions are granted for my app. Most directories can be accessed just fine, but one is not.

    File test = new File("/storage/emulated/0/Pictures/aDirectory");

    boolean writable = test.canWrite();
    boolean readable = test.canRead();

writable and readable returns false so test.listFiles() returns null. Yet, the same directory can be accessed from another activity. Help please.