I would like to copy data from one hosted feature service to another and maintain attachments. Creating a local copy in arcmap does not seem to hold attachments.
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ArcGIS Pro maintains attachments with append.
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I had exactly the same issue, after creating an AGOL application that uses database attachments I realized that these attachment are not copied to one SDE instance to another in SDE 10.2. This functionality is available in ArcGIS 10.5.