Hi @Beatriz Martín Morell welcome to the Atlassian community.
Kindly retry in other browsers (incognito) and let us know.
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May I know the Confluence version you are using? As you see inline my screenshot, option is not showing up. Alternatively, please check with your site administrator who manages enable/disable options.
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I'm one of the site administrator.
I have found the problem, you should give the emoji a name before clicking in "Choose file"
Thank you for your cooperation!
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