Apple Resources - Sharing Files

Email (15MB) and iMessaging (1 GB ?)  
  Who would have thunk it--send large files via iMessage

Apple Resources - Screen Sharing


AirDrop (Between nearby Apple devices)

Dropbox (Share on all platforms and with anybody)

Share via Thumb Drives or External Backup Devices
  Always eject BEFORE disconnecting an SSD or Flashdrive  500GB   1TB   2TB   4TB
Your Sandisk Portable SSD May Require a Firmware Update