Is there a way to get the media which was modified after it was created ? In other words, is there a flag or a field for lastupdate or lastmodification ?
There is no flag for telling if an entry has been updated, but there is a field that keep the timestamp of last update in "updatedAt". you can filter entries by "updatedAtGreaterThanOrEqual" or "updatedAtLessThanOrEqual" by list action through Kaltura api.