How to Install Your Own Green Screen Backgrounds in FLOW
Make sure that your background graphic is at least 300dpi up to the maximum print size in your packages. Otherwise the background on the final print will appear low-resolution.
Open Windows Explorer (i.e. open any folder)
Navigate to (or copy and paste) C:\ProgramData\Flow
Note: This is where all of your FLOW data files exist. It is a hidden folder which means you have to paste the path into Windows Explorer. If you're in and out of this folder a lot, consider creating a shortcut.
Open the Backgrounds folder (C:\ProgramData\Flow\Backgrounds) and place all of your Background files in this location