Screen Sharing won't allow me to paste into remote system
Apple answer: https://support.apple.com/kb/PH14152


  Choose Edit >Use Shared Clipboard.
  Using the shared clipboard, you can:
  
  Copy text and images from documents on one Mac and paste them into documents on the other.
  
  Select and drag text and images from one Mac to the other.
  
  Copy a link from your web browser and paste it into a web browser on the other Mac.
  
  Copy text from a document on one Mac and drop it on the desktop of the other Mac to create a clipping.