You are free to use a single caption for all SmartFrame images within a Gallery, or to use separate captions for individual images if you prefer. This can be determined in the Themes section of the Admin Panel
Single Caption for all images within a Gallery
To use a single caption for all images in a Gallery, click on the Theme you would like to use for the Gallery in the Themes panel before selecting Edit. Now select Caption from the left-hand-side menu and make sure the toggle next to Add a Caption is set to blue. Now enter the text you would like to use as a Caption before clicking on Save. Please note that this change will apply to all embedded SmartFrame images and Galleries that use this Theme.
Multiple Captions for different images in a Gallery
If you would prefer to have separate Captions for different images within a Gallery, follow the process described above and use the Insert metadata drop-down menu to insert the metadata value you would like to use as the Caption, such as Description or Title. This will automatically add whatever copy has been added to these fields in SmartFrame metadata section of the Image details page for a specific image. You can also replace the “Optional Default Value” copy with text that will be used if there is no copy in the metadata value field you have chosen.