We've spent a lot of time thinking about the end-to-end VR & AR production process and we designed Sketchbox so that your entire team works together effectively.
For people who are not comfortable with VR our customers have found in-person demos to be the most effective. If you schedule an in person meeting and use presentation mode you can step your client through your prototype/storyboard. Since their controls are disabled they won't be able to mess up the scene or 'make a mistake'.
When people are comfortable in VR, you have more options:
Export your Sketchbox scene as an FBX (see below) then upload the FBX to Sketchfab for free. Please refer to Sketchfab here.
Learn about how Sketchbox saves files here.
To share a Sketchbox file with another user, send them your .SBD file. They should put the SBD file in their %USERPROFILE%/Documents/Sketchbox folder. Then they'll be able to load that Sketch from within Sketchbox.
Once your design team is happy with the prototype/storyboard that they created with Sketchbox, they can export each Sketchbox scene as an FBX file. Your development team can open the FBX files with Unity, and use the FBX files as a 'skeleton' to build on top of. The FBX export from Sketchbox will tell your development team everything they need to know - including what objects are in the scene and how big they are.