I've uploaded an html file to a card in a private board, but the file is public, is not protected by a token, It's a public long url.
Hello @Juan Pizarro ,
Attachments in Trello have no security token or expiry. They are essentially very long (random) urls, and protected by the "unguessable" url.
If you need more security, you'd need to put attachment into e.g. Google Drive or Dropbox (or similar).
If you had to thrive a new habit during a lockdown, what would it be? Trello
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