Dustyduster

Hi, I have bitsync installed on my pc (win8.1) and on my android phone (android 4.2) Situation: 1: Copy a foto.jpg on my pc into the bitsync folder on my pc. 2: I see the foto.jpg in the bitsync android app "ALL FILES" (now the foto.jpg is not physical on my phone right?) 3: When i hit the foto.jpg in "all files" section. bitsync will download it to my android phone. 4: How can i delete foto.jpg from my phone, but not from the rest of the devices?