My native module doesn't work

[jihoobyeon]

Hello,
I made a native module for file picker, self-advised by those:
https://microsoft.github.io/react-native-windows/docs/native-modules
https://github.com/microsoft/react-native-windows-samples/tree/main/samples/NativeModuleSample/cppwinrt
https://github.com/microsoft/Windows-universal-samples/tree/main/Samples/FilePicker

but when I ran my app, it says Cannot read properties of undefined. no more error informations.
note that I'm not well experienced at C++, can you guys see my code and find whether what I did wrong or it is a bug?

[jihoobyeon]

My module haven't autolinked. so I had to manually link it.
however, this made another issue: #10684

[jbcullis]

Here are upload and export samples - https://github.com/jbcullis/react-native-windows-fs

Nb. These aren't generic so you'll need to make some adjustments based on your needs.

[jonthysell]

It looks like you've created the native project on your own, so you're not referencing any of the Microsoft.ReactNative dependencies you need to build a native module.

Please read https://microsoft.github.io/react-native-windows/docs/native-modules-setup#creating-a-new-native-module-library-project to see how you can use react-native-windows-init to set up your project with the correct dependencies.