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Refresh a form or event preview graphic

Extra step for Telegram:

If a url has been shared previously the preview is cached and will not update automatically. To force a fresh link preview, 3 options:

  1. shorten the url
  2. change the url by adding dummy parameters at the end (?V=1 say)
  3. go to https://t.me/WebpageBot and submit the url to force a refresh across Telegram