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Dates in the Media resource:
L_UpdateDate - Updated whenever listing data is changed. Not really useful for photos.
L_Last_Photo_updt - Updated whenever images are added/updated/deleted/reordered for the listing.
MED_update_dt - Updated whenever that particular media item is updated. A photo label change, for example may not be reflected in the Last_Photo_updt field.

When working with the Media resource, I would suggest that you use the L_Last_Photo_updt as your incremental. Then it would get all the image URLs for that property whenever the photos change.