Starting with the Quartz release of ArcGIS Runtime and ArcGIS Server 10.4, you will have more flexibility when dealing with attachments. You could choose to not download existing attachments but still be able to upload new ones during sync.
There have been many improvements to ArcGIS Enterprise and ArcGIS Maps SDKs since this Idea was originally logged. If there are still suggestions for improvement, please log them as a new Idea.
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