Hello,
Yes i have submitted KYC, and now i am verified.
You just need one card for KYC (driving licence or a National ID card) choose just one of them, not both.
For the back and front sides, when you click on "Choose File" select both side scans or pics at once from your computer or phone, and then submit them.
If you didn't understand or if you have another question, don't hesitate to ask. Thanks.