Hello.
Just to inform that the plugin have a little bug.
In file wp-google-drive/class/settings-class.php, there is a line as follows:
<form action="<?php echo get_option('home'); ?>/wp-admin/admin.php?page=configure_google&action=auth" method="post">
The correct is:
<form action="<?php echo site_url(); ?>/wp-admin/admin.php?page=configure_google&action=auth" method="post">
Because some blogs are installed in different folders (not in the server root folder), and the plugins must respect the wordpress instalation folder.
That's it. Best Wishes!