There can be several connection modes for a device running Android™:
- Multimedia peripheral (MTP) : requires the installation of Android File Transfer
- Camera (PTP) : files can be copied only into the folders "DCIM" and "Pictures" of your device. A driver will install when you plug it in the 1st time.
- Mass Storage (MSC) : your device is detected as an external hard drive et requires a manual confirmation. A driver will install when you plug it in the 1st time.
- Android Debug Bridge (ADB) : specific mode for applications developers. A driver is required.
To check which connection type you are using on your device, go to (or) Settings > Storage
and then press Menu (or the dedicated button of your device) to display USB computer connnection.
It is recommended to use the MTP or MSC mode to transfer your files. Your device will be then visible in Finder.