The portable sign/icon is grey because the software is not recognizing your device. In order to fix the issue, press Windows + R key combination, type devmgmt.msc and click OK. Expand the Universal Serial Bus controllers list, right-click on the driver and select Uninstall. Reboot the PC, connect the Samsung device using the USB cable and press Scan for hardware changes icon from Device Manager. If you still have issues, I suggest you download and install the latest version of Samsung Media Studio from Samsung Download Center. Scroll down to Support section and click the Multimedia Studio button. If you still have problems, you can use
800-7267864 phone number to get in touch with the support team.
Alternatively, you can transfer the music files by using copy/paste feature. Right-click the files you want to transfer, press copy, connect the device to your computer, open its drive from My Computer/Computer and paste the songs.