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Select “Iframe Macro” on the dropdown:
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Configure the macro settings as below:
width: This controls the width of the embedded content on the Iframe for Confluence macro;
height: This controls the height of the embedded content on the Iframe for Confluence macro;
style: This allows managing the CSS style of the embedded content (it doesn’t affect the page style);
id: This allows adding an id to the Iframe for Confluence macro;
class: This allows adding a class to the Iframe for Confluence macro;
Click “Insert”;
Add the desired URL on the Iframe Macro text configuration: