Found Caja preferences; changed to NOT automatically read.: no luck.
Discovered Caja has no options for Android - it does for EReader but seems not to recognize Calibre. (screenshot)
Tried to open Phone with Calibre programm itself: no recognition.
Found a trick to see files on the Android-phone, also open and read .epubs on it with Calibre app, and even drag Calibre books to the phone from main Calibre programm.
But the Calibre main programm itself will not acknowledge the phone from Linux - as it does from Windows.
