Yes! There are two ways of doing so.
The first way is to simply select the file you wish to share. Once selected, an options bar will appear at the top right. Select Copy Link (third option) to share the file.
The second route is to invite users into your Collab room, open your browser, go to app.gravitysketch.com and log into your account.
1. Go to "My Files"
2. Right-click on your Collab room
3. Click on the "Share"
4. Enter the email address (you can add multiple addresses at the same time) and click Invite.
Once the invite is sent, they'll receive an invite email and once accepted the room will then appear on their account (on app.gravitysketch.com and in their VR space).