I'm sorry to hear you too are having this experience! What browser are you working in and how are you adding in this URL (directly typed, pasted via mouse, pasted via keyboard shortcut)?Are you receiving any error messages? We have seen cases where URLs don't save when a user is making changes to Social Media Button that already exist. Are these new icons you have inserted or are you updating already existing ones? In these cases we always suggest trying a different browser or even inserting the URL by a different method. Please let us know if either of these workarounds work. This is something we would be happy to continue troubleshooting.
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