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Have you purchased an addon for Connections such as one of our premium templates or extensions with a valid license and you need help?
No, a checkbox would not work because then a user would be able to select multiple checkboxes. You have to use radios to enforce the only a single selection being made.
I am aware of not being able to deselect once an option has been chosen and I will address it in a future update. But right now the only way to deselect is to delete the link and add a new one. Not the best solution, but it does work.