When i try to add .fbx files to content browser it doesnt allow me to drag and drop. i must use import. is this normal or am i missing something?

Development Pipeline & Plugins
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The imported path of the imported asset depends on the current location of the Content Browser while importing. Make sure to navigate to the appropriate folder prior to performing the import. You may also drag the imported assets into a new folder once import is complete:

taken from this page: FBX Static Mesh Pipeline in Unreal Engine | Unreal Engine Documentation

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Another link on importing: https://docs.unrealengine.com/latest/INT/Engine/Content/QuickStart/4/index.html