In some instances, attachments are dropped when a feature class is exported between geodatabases. A common scenario for this issue is when attempting to export a feature class with attachments from an enterprise geodatabase to a file geodatabase.
Export and import operations do not carry relationship class and related items along, resulting in drop of attachments.
Copy and paste the feature class with attachments to the desired geodatabase. To transfer a feature class with attachments from a enterprise geodatabase (EGDB) to a file geodatabase (FGDB), follow the instructions provided below:
Note: The above given steps are in a scenario where the feature classes with attachments needs to be copied to a FGDB. The same workflow can be utilized when copying feature classes from a FGDB to another FGDB or from an EGDB to another EGDB.