I’ve just replied to your email but I wanted to share the solution here too.
You’ve definitely caught us at a bad time, since we are in the process of updating our web version, so that all the latest features and controls are available there too.
For now, myBalsamiq (our web version) still uses the previous version of our editor which explains which you may see some tiny differences in your project.
That being said, this won’t be a problem for too long because our new web version is already in private beta!
Since you’re using Mockups 3 for Google Drive, I would recommend to share the file directly from them with your clients. They will be prompted to install the tool but viewing your wireframes there is free, it’s only the saving functionality that expires after 30 days. Also, you can easily give your clients read-only permission (i.e., “Can view”), so they will be able to view your mockups but not edit them.
You will find all the details on this page.
Hope this helps! Please let us know if you need anything else.