Unable to view figures in Excel files for review

Are embedded figures or images in Excel files (.xlsx) supported in Collaborator?  We have a program group trying to view a set of requirements in an Excel spreadsheet.  The spreadsheet data/info looks fine in the rows/columns but Collaborator does not seem to include the figure when the excel file is uploaded to the review and reviewed in the diff-viewer.  Does Collaborator have current functionality to support this review feature?

We are using Collaborator v13.4.

Thank you.