On-camera storage for AXIS cameras (also known as Edge Storage or SD card storage) provides video recording redundancy. Symphony automatically detects if an AXIS camera supports this and has been configured for on-camera storage.
In the Timeline, a contrasting green bar (magnified in the following figure) indicates that video was not recorded locally in the Windows machine, but Symphony is already downloading the video from the AXIS camera. Symphony does not analyze video downloaded from the camera. As such, it does not determine activity type, for example, broken rule or video signal lost.
See https://www.aimetis.com/Support/kbarticle.aspx?ID=10092