After setting all the options for an RSS feed, you can either choose to save it straight away using the
[Save] button...

...or you can preview the results of the options you have set by pressing the
[Preview Feed] button.

The preview function allows you to quickly see how your templates are working, whether the feed URL is correct, etc.
Occasionally, the preview may also give you useful information about the feed, such as suggestions for options.

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