Terraindata, please help!! :(

I am building my project into flashplayer but when i open it on browser, the terrain is missing. My character sinks. And also when i use plane and build it on flashplayer, my character doesnt walk. Please help. Im just a begginer, i hope you can answer me

Terrain isn’t supported when deploying to Flash. See documentation. Couldn’t say why your character can’t walk on a plane without knowing more.

Stick with it, Unity has many drawbacks but its foundation is powerful.