ME4012 connectivity issue

Please Help someone!!! 

I have got a Dell powervault ME4012 with 2 hosts connected.

I have 2 hosts both running Windows Server 2019.

I created 2 virtual discs on the SAN and presented them to both hosts and the initiators are all mapped ok.

When i log onto the hosts, i have set up both discs and thats fine, 

but here is the rub.

When i add a file onto one of the drives from one host, if i swap to the other, the file is not there

Dont get it, i presume i have done something wrong but cant figure out what

Please help