As far as planning goes I always like to recommend Drone Deploy.
It is free for planning purposes (it makes you start a trial, but this is only for processing), allows you to plan on the computer or tablet, allows for KML and SHP import for boundaries, has terrain awareness, has more 3D mission plan options, has gimbal angle control, and I really like the UI.
Haven’t really found any other free planners that have all of these options, but I’m sure I haven’t tried them all.
Just another option for you as far as mission planning goes
For Android as well as Mac/Apple now? It was only Mac when I had my trial.
I manually adjust way points for terrain in Litchi after planning in DJIFlightplaner these days, then of course WebODM for processing, as DroneDeploy is eye wateringly expensive for large jobs.
You’re correct, I apologize. Yes it appears that they still have not implemented Terrain Awareness on their Android app. That’s a bummer, I just didn’t notice because I normally use an apple device.