You can use Modelo as a file transferring hub, just upload the file to the Asset folder and share from there:
1. Create a folder in the Assets tab, and click "upload":
2. Upload your Revit file into the folder, after it's done, click the "share assets" icon, you'll see it when you hover above the file:
3. Now you can type in the other party's email and add a message if you want:
3. Click "send" and you are all set.