You have a few options. You can add them as a viewer to your account so they can view the file. They cannot make changes as a viewer but they can see it. There is no charge for viewer seats. You can add them as an editor to your account and they can view and edit the file that way. There is a charge for editor seats. If you have a paid account, you can download the .rev file and share that with them. They can import the .rev file into their account and view it that way.
