MediaWiki:Gwtoolset-specific-tooltip/en

Using the following fields you can apply a phrase (optional) plus a metadata field as the category entry for each individual uploaded item. For example, if the metadata file contains an element for the artist of each record, you could add that as a category entry for each record that would change to the value specific to each record. You could also add a phrase such as and then the artist metadata field, which would yield  as the category for each record. Category names should generally be in English (see Commons:Category names).