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When downloading a large hosted feature service with attachments from ArcGIS Online to a file geodatabase, a known issue may occur that results in an error, or in missing feature layer attachments. One possible workaround for the issue is documented in the following article, Problem: Unable to export a feature layer with attachments from ArcGIS Online for Organizations to a file geodatabase, which suggests creating a replica from the REST endpoint of the hosted feature service and downloading it as a zipped file geodatabase.
In some instances, attempting to export the hosted feature service with attachments from the REST endpoint fails, or results in missing feature layer attachments.
The following are two possible causes of the issue:
As a workaround, add the hosted feature service to ArcGIS Pro and use the Feature Class to Feature Class tool to export the hosted feature service to a file geodatabase.
Note: The ability to maintain attachments of features is supported by the Maintain Attachments environment, which was introduced in ArcGIS Pro 1.3. The Maintain Attachments environment setting allows enabling and disabling the transfer of attachments to the output table or feature class.