Partial post from bdaniels above,
If you want to use the Casting feature, then you can use the included tablet or your phone to Google cast to the display - I presume you'll use optical or ARC to get the sound back to your receiver. I use optical and it works just fine.
From Wikipedia, the free encyclopedia- Optical cable
Hot pluggable Yes
Audio signal Digital audio bitstream. Originally limited to 48 kHz at 20 bits. Extended to support all modern formats (Depending on manufacture and specification)
Cable Optical fiber, ~10 m (33 ft) maximum
Connector JIS F05 (JIS C5974-1993 F05)
Width 32-bit audio packets
Bitrate Originally 3.1 Mbit/s; now 125 Mbit/s
Max. devices 1
TOSLINK (from Toshiba Link) is a standardized optical fiber connection system. Also known generically as an "optical audio cable" or just "optical cable", its most common use is in consumer audio equipment (via a "digital optical" socket), where it carries a digital audio stream from components such as CD and DVD players, DAT recorders, computers, and modern video game consoles, to an AV receiver that can decode two channels of uncompressed lossless PCM audio or compressed 5.1/7.1 surround sound such as Dolby Digital Plus or DTS-HD High Resolution Audio. Unlike HDMI, TOSLINK does not have the bandwidth to carry the lossless versions of Dolby TrueHD, DTS-HD Master Audio and LPCM.
As the red highlight says; you may be losing some audio versions from your BD player with optical. So, connecting thru your receiver is slightly superior as I was told in another thread.
I'm NOT trying to start a debate; but, add clarity that another had done for me.
Samsung UN82MU8000 4K UHD TV | Onkyo TX NR787 9.2 AVR with Klipsch R-15M L&R and R-34C front stage speakers | Klipsch G-12 surrounds | 2 Atrium 5 Front Tops | 2 Klipsch R-14SA Rear heights | Dual BIC RtR EV-1200 Subs | 5.1.4 Atmos system | Samsung UBD M9500 BD Player | FireTV 4K | Logitech Harmony 750 | TIVO BOLT OTA 849000