It would be helpful to have other options for loading/importing custom tile packages (TPK files) into Collector on an iOS device other than iTune File Sharing. I typically create tile packages of the most recent NAIP imagery and other raster data for large areas (often 7-800 MB). Rather than uploading them to AGOL and burning through credits for data storage, we load or import the custom tile packages into Collector via iTunes File Sharing as described by the "Go Offline" workflow (http://doc.arcgis.com/en/collector-classic/ios/collect-data/offline-use.htm). It would be nice to have the option for importing them through file sharing programs like Dropbox, Google Drive, One Drive, or even WeTransfer.com. There are also a variety of flash drives for iOS devices that could deliver the TPK files in the field without the need for a computer or bandwidth at all. Programs like Avenza Maps have this functionality.