I have researched into this topic, but have not found an updated answer. Has ESRI Collector for Android decided to support tile package (.tpk) storage on SD cards? I understand that there were performance issues with SD cards during testing. I would like to know if anyone has experimented with this or if Collector plans on including this feature in future iterations? I need to make a disclaimer that I have not tested saving .tpk files in an SD card - I wanted to check here first.