Retaining attachments while merging two records in the same feature class

abaldenweck@blm.gov_BLM_EGIS

I have a feature layer (pretend it's buildings on a college campus) containing a record for each building. 

Each building has one or two photos attached to it via Collector. 

I want to merge the buildings by function (e.g. all the dorms, the engineering buildings) into a multipart polygon, and I want to retain the photos attached to each record once they are merged. (So if Dorm A has 3 photos and Dorm B has 2 photos, I want the combined "Dorm" record to have all 5 photos).

I tried testing it and the Merge tool in the editing toolbar threw out pictures for the other record.

I tried googling it and found these two articles, but they seem to  be geared at combining datasets, rather than working within a dataset.

Is there a way to do this cleanly?

Thanks!

Edit: This tool here:

 

Scott_Harris

@AlfredBaldenweck Oh I'm sorry, yes, it seems the workaround that I suggested would only be applicable if you have access to the attachments table (i.e. in a local GDB).