Altitudes MSL OR AGL

I am importing waypoints to litchi that contain altitudes in MSL. I am trying to figure out how litchi uses the altitude info. I’m assuming litchi uses AGL but is that from takeoff point? This flight will start at 400 feet agl (1080 MSL). What altitudes do I put in at each waypoint and do I need to convert msl to agl. I also don’t understand what the above ground selection does. Thanks.

First, welcome to the forum.
From where are you importing your waypoints? How were they generated?

Here is some info put together by one of the forum members.
Click the 4th box down ‘What is the Above Ground Option?’ It will help explain some things. Hopefully it will help.

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