Migrating attachments to a related records table in Data Pipelines

CScriven — Wed, 04 Feb 2026 22:17:46 GMT

I’m trying to use ArcGIS Data Pipelines to transform a dataset that currently has:

A polygon feature layer with attachments

into:

A polygon feature layer, and
A related records table (1:M)
with the attachments stored on the related records, not on the parent polygon.

So far I’ve been able to migrate geometry and attributes into the new schema, and I can create the related records correctly. What I haven’t been able to do is get attachments to write to the related records table.

I followed the configuration described in the documentation (see Limitations), including:

Using Add and Update
Setting a Unique ID field for matching
Ensuring attachments are enabled on the target table
Ensuring the relationship class is correctly defined

…but attachments still do not appear on the related records in the output layer/table.

Question:
Is Data Pipelines currently able to write attachments directly to a related records table, or am I configuring this incorrectly? If this workflow is supported, what’s the correct pattern to target attachments for related records instead of the parent layer?

Any guidance or examples would be appreciated!

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Migrating attachments to a related records table in Data Pipelines