Welcome to the Community,
you cannot mount a snapshot vmdk in the GUI. What you need to do is to remove the VM from the Inventory (DON'T delete from disk) and edit the VM's vmx file, replacing the mounted vmdk file. After doing this, right click the vmx file and select "Add to Inventory".
From the file's time stamps the latest snapshot should be 000038 (the numbers don't necessarily be in an ascending order). However, it looks like you tried to boot the VM from the base vmdk file. At this point you will most likely end up with a "parent has been modified" error message. What needs to be done in this case is to repair the snapshot chain. To do this, you will need to edit the "AG-Atlas2-000002.vmdk" file and replace the partentCID value with the CID value of the "AG-Atlas2.vmdk". If the parent file name in "AG-Atlas2-000002.vmdk" is not "AG-Atlas2-flat.vmdk", archive/zip all the small vmdk files and attach them to your next post. To edit the files you need to either login on the console or access the host via ssh.
André