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Enable the content plugin Slide Tooltips if you wish to enable tooltips inside slides of article origin.

Categories The article categories in which to add the tooltip extra fields. Usually, just select the categories that contain articles that will be slides
Subcategories Whether to include subcategories to the list of categories
Count The number of tooltips to show per slide (up to 5). It limits the number of fields added to articles (to avoid over-crowded interfaces)

Tooltip fields show in the Images and Links tab once the article has been saved with the proper category selection. It is due to the fact that the plugin does not know in which category articles are until they are included into one.