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In space configuration, you can globally restrict access to options available to choose from while creating a link. More information: WIP - Global Space Configuration
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In the Email Template tab, you can customize email contents sent from External Share with your own content and layout.
Custom HTML and CSS
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In the Custom HTML and CSStab, you can add custom CSS and HTML to all External Share pages.
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Custom Domain
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In the Custom Domaintab, you can configure a custom domain to make your shares available in your own domain.
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