Hi,
with a little help I found out how it works:
there are some extensions/addons available. They work for IOS and MAC.
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You find extensions here: Add-on Release - Marginnote
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Download the mnaddon-files/ open the files in the ios-browser, choose Marginnote3 to open this file…
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After that the Addon/Extension will appear in the 3…dot- area, in Extensions.
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need to restart