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In ArcMap, when adding an attachment to a geodatabase feature class, editor tracking is not triggered. Thus, fields associated with editor tracking (such as the CREATOR, EDITOR, CREATION DATE, and LAST EDIT DATE fields) are not updated.
This is by design. The editor tracking features apply only to the primary table, and ignore the related attachment table. When assigning privileges to a feature class, the privileges propagate through the relationship class to the related attachment table. This limitation applies to all related tables, including attachments.
There are two solutions to ensure any attachments submitted by users are being tracked.