New ArchivesSpace Videos in the Video Training Library

New videos have been added to https://training.atlas-sys.com/Course/Details/4223

Archival Objects Overview: https://training.atlas-sys.com/Course/ShowEmbeddedVideo?videoid=14748

Archival Objects - Basic Information: https://training.atlas-sys.com/Course/ShowEmbeddedVideo?videoid=14749

Archival Objects - Instances: https://training.atlas-sys.com/Course/ShowEmbeddedVideo?videoid=14747