Me and my colleague are trying to fix an error when we are testing to upload the file to the storage in our PHP test project. The error is called:
FatalThrowableError (E_ERROR): Call to a member function getRealPath() on null


We are using Laravel to create a new project. Can help what code has the problem and how to fix it?

Here is the project zip file: https://1drv.ms/u/s!AqKGcmac7PpVgdUraHfDoXoZ2zpXFA