A:AnswerHello! Yes, it does play USB. You can see all compatible formats at page 6: https://eng-ca.faq.panasonic.com/euf/assets/PDFs/Blu%20Ray%20and%20DVD/DPUB150_TQBS0382_ENG.pdf
A:AnswerYes. To my knowledge, 4K discs don’t have regional restrictions so it should play any disc, from any region. If not, Best Buy will accept returns within a reasonable time frame. Good luck!