There is a source image with a flat plan

To add this plan to an existing tour, you must go on a virtual tour.

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Select the properties of this tour

Click on "Floor plan/image".

Confirm the question of adding a "flat" image

Select an image from the opened Windows Explorer

Wait until loading and processing is complete

Adjust the image information by analogy with any panorama.

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Then add transitions to panoramas to this image.

As a result, we get about this.

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Close the tour properties (Press the second button at the top - all changes will be saved automatically).

P.S.

The uploaded image is recognised by the True Virtual Tours website as another panorama.