If you’re still having problems with connecting Android to a Mac, SyncMate is a paid solution that works every time. Here’s a link to SyncMate
The error message “Can’t access device storage, Make sure that your device is unlocked and ‘File Transfer’ or ‘MTP’ mode is selected” can be solved using the following steps (on most Android phones):
1. Go into your Android phone settings (gear icon).
2. Try “Storage and USB” but if you can’t find “MTP (Media Transfer…