My device that has Calibre Companion installed is having an issue with Ver. 5.4.4.7 (398). Attempting to connect returns "Library is read only - CC cannot connect because the following book formats are stored in a read-only format:azw3, azw4"
Screenshot:
https://photos.app.goo.gl/Sy8tfSv2Twc1VqRg6
My other phone with Calibre Companion Ver. 5.4.4.6 doesn't have this issue. In fact, I have Calibre Companion installed on several devices and none have experienced this issue up to now. Any help appreciated.