Every time I try to drag a file it gives me an error?
What is the error?
Are you using Windows? I don't have the ability to test on Windows so it may not work there at all.
You can also rename the game data file to "game.bitsy" and leave it in the same folder as the game itself. It should then load it automatically.
I tried this method and the same error came up. It says "Error 1 Invalid game data."
Another possibility is that the game data and room version are not supported.
Bitsy3D currently only supports Bitsy version 7.10 and room format 1. You may have some luck just manually changing the version of these values in your game data file.
Also, make sure you're using the game data export and not the actual HTML game itself. :)