You just have to change the cloud interface, from Ethernet6 to FastEthernet8
For this, click on the green triangle:
Then click on the cloud and choose the FastEthernet8 interface:
After being like this, the ping and connectivity will be successful.
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3 ways to fix issue of Cloud PT picked FastEthernet8 instead Ethernet6.
to change it now, existing Cloud settings, you must start with Ethernet6 settings, change connection from DSL to Cable. then on Cable settings, remove link Coax7 to Fast Ethernet 8, and add Coax7 to Ethernet link. just like pictures in pdf document you provided except there is no FE8;
Or Delete Cloud PT only and drag new one, set up as pictures in pdf document
Or change link to FastEthernet8 as Luis_C showed you
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