Document Share Preview Zoom

When a document is shared via the share link in the adobe programs and is sent for approval. 

How can one communicate what 100% might look like. 

For instance if I share banner that is 36" x 56" the preview will display completely zoomed out, so my client will never know what the artwork looks like at 100%, meaning they will never know when I am trying to show them something that is pixelated because they have low quality images.. 

I know it might also be a difficult thing to achieve because of user zoom preferences in the browser. 

Does anyone have any idea on how to communicate this or what a future verison of preview may look like. 

Are people getting feedback from other programs instead of the share link; like frame.io? 

Let me know your thoughts!