An email chain is an email with a subsequent response. Apple expects you to email from the photo app.

Sure would be nice to have an "attach item" menu option. More steps isn't simple, it is inelegant and cumbersome, IMO.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue