HEIC from iPhone in the browser — no desktop converter, no upload

<p>I still get HEIC files dropped into Slack with a cheerful "can you resize this for the docs?" They look fine on the sender's Mac. They open as a mystery blob on my Linux box, and half the preview tools just shrug.</p> <p>For a long time my default was: AirDrop to a Mac, open Preview, Export as JPEG, send it back. Or worse — upload to whichever "free HEIC converter" ranked first that week, wait

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