Picture. Size. Quantity. Email Warehouse. Greg is copied.
If buttons do nothing and you cannot scroll:
You are in Mail / Files preview. That view is a picture, not the app.
iPhone: tap Share (box with arrow) → Open in Safari. Then Add to Home Screen.
Android: Open with Chrome, not the Gmail preview.
Form is live. Date/time stamped. Scroll and tap + / −.
Not a 3-piece system. Wet wall is the 1-piece surround. Findlay sizes are locked below.
The number that matters is the REAR — 57" to 59" in 1/4" steps. Add a second line if two units are different widths.