The configuration on the Attachment Viewer app doesn't currently have any tools to allow for filtering of the image attachments being displayed within the app. I would find a 'Date Filter' particularly useful, as a means to limit the number of image presented within the app.
I appreciate that, as a developer, I could apply a date filter within the WebMap that underpins the Attachment Viewer app, but this isn't really a practical workaround for the average user.