In some ocasions it can be usefull make the orginal of a photo available to your website visitors. For instance this option was a request by an association which wanted to eliminate the hassle of exchanging USB sticks all the time to exchange photos.
The plugin allows you to add a download button for the original photo format. It will be displayed on the right of the photo title in the image viewer. You can enable or disable this option in the plugin settings (disabled by default) and you can control it on a per-expression basis. On this website, the download option for original photos is disabled. However, for the following example downloading is enabled by using the corresponding attribute.
Example: Enabling the download option of the plugin
Note: This option is only available when the original photo format is available for the plugin. In most cases this means that the plugin requires to be linked to a flickr pro account, that the plugin is authenticated and that the photos are from the linked account.