InVision offers a number of integrations and add-ons that let you incorporate Google files in Freehand or InVision V7.
Google in Freehand
Use the Google add-on to embed documents within the Freehand canvas so your collaborators can easily access related project work. Learn more here: Embedding Google Documents in Freehand.

Google in InVision V7
This feature is not yet available to all V7 Enterprise customers. Stay tuned for future releases announced here: Release Notes: InVision V7.
Add Google files to InVision to keep all project-related items in one place and give collaborators the files they need to do their best work. Learn more here: Adding External Files and Links to InVision.

To learn more about InVision V7 integrations and add-ons, see: InVision V7 Integrations.