Problems working together

[Barnoe]

Hi I am new to the forum 

I have 2 amazon echo's

Both set up and working, however I have a couple of questions.
I have created a group called everywhere and if I say "Alexa, play BBC radio 2 on everywhere group"
Then it works on both.
If one echo is already playing, how do I ask Alexa to play on both Echo's?
If I use the above command it's fine with radio but with a playlist or album it starts again from the beginning?

Thanks everyone