Any files or directories which start with dot are hidden. They cannot be seen from file browser. Open you terminal and
ls -a
now you will see your .ssh directory listed. make sure you are using ls -a command in the right home directory. If you able to cd ~ssh from one user then use ls -a command in the that user's home directory.
If you really want to see the files in the file browser then create a directory without starting with a dot and copy all the contents from the .ssh directory to the new directory which you have created.
sudo mkdir /home/user_name/sshfolder
sudo cp /home/user_name/.ssh/* /home/user_name/sshfolder/
Now open you file system browser and verify the contents.
I hope this is helpful.