...
<physdesc altrender="part"><extent>4.16 megabytes</extent><extent>(36 files)</extent></physdesc>**
**Please note that the born digital extent should not be added by the processor. It will be added by the metadata archivist after the finding aid is published in ArchivesSpace.
Extent expression type #3 (a/v collection) NOTE the extent expressions are in separate <physdesc> tags with attributes specifying "part":
...