The single bay My Cloud units do not support third party apps like Plex.
https://support.wdc.com/knowledgebase/answer.aspx?ID=11425
If one uses the forum search feature, magnifying glass icon upper right, they’ll find numerous past discussions on Plex and the single bay My Cloud.
For example there is an unofficial way to enable the “apps” tab on the second generation single bay v2.x My Cloud units.
It should be noted the single bay My Cloud units include Twonky Media Server to provide DLNA media serving to any DLNA client on the local network. Check your TV’s documentation to see if it supports accessing a DLNA media server and how to do so on the TV.
