Unfortunately we do not support a "link" custom field type. If you think about how the custom fields interface works right now, a "link" custom field wouldn't even be clickable since it when you click on a the value of a custom field, it goes into edit mode, so you wouldn't be able to open the link without copying and pasting the text value of the link.
Hello Community! My name is Brittany Joiner and I am a Trello enthusiast and Atlassian Community Leader. I'll be sharing with you a series of videos with my top tips on how to best use Trello...
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