Note: This feature is only available on the Pro and Studio plans.
From time-to-time, you may find it helpful to copy the filenames of a specific set of photos in a virtual IPS gallery.
To copy the filename(s) of whichever photo(s) you have selected, select the photo(s) and click the "Copy Filename" button in the top bar of the "Photos" panel while editing a gallery.
To select multiple photos, you can:
Click on one photo and then command-click on each other photo.
Click on one photo and then shift-click on another photo. This will select every photo between the first and last one.