Welcome to the forum.
1. Not sure, but there are only a couple ways to format a microSD so I'd try it first. But, see no. 4 .
2. Can't help here, I use Poweramp.
3. Don't use Whatsapp
4. You will receive a port dongle with your S8 that is used to make a cable transfer from your old phone to the S8. I am not sure if a Lumia is compatible, you might search the forum, or Samsung, for "smartswitch" and see what turns up. It did a great job on my S7 to S8 and also backed up the SD card in the process.
06-04-2017 08:50 PM