How to create a zoomable PDF for iPhone Safari

Our website has a system map that is a PDF. For a shortcut, use and click on Download PDF. If I view that file in iPhone Safari, I can’t zoom it to the point where it’s readable. I try the two-finger zoom and it snaps back to a smaller size.

How do I create a zoomable PDF for iPhone Safari? The current file is already 7MB and I don’t want to make the file even larger.

I can zoom this page on my old iphone 4(ios7) with no problem. It zooms right up so you can read it with ease.

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