HT205245: Edit your photos using third-party extensions in Photos for macOS
Learn about Edit your photos using third-party extensions in Photos for macOS
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Helpful answers
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Oct 24, 2015 5:32 AM in response to Patorvicby léonie,★HelpfulNot yet. The available app extensions are all for retouching or other effects.
Have a look at this discussion: Re: How to add text to photos in the Photos App on El Capitan
Currently you can only add text in an external editor and reimport the photo., for example, addd the text in Mail.
If you want to write captions onto the photos for sharing the photo by Mail, you could use the "Markup" extension directly in Mail.
To send a photo by mail with text added, use "Share > Mail", then click the Markup tool. It is hidden in the hidden actions menu in the upper right corner of the inserted photo in the Mail window.
Then add a text box wherever you want and format the text:

