What counts as proof in a product slideshow?

Show the actual product action that supports the claim you can substantiate. A before-and-after workflow can be useful if the comparison is genuine and its conditions are clear. Do not turn an illustrative mockup into apparent evidence of measured customer results.

If the benefit has not been measured, demonstrate the mechanism and use appropriately limited wording. “Here is how the rescheduling flow works” is a different promise from a quantified time saving. The visual should make that distinction easier to understand.