Route [user.id.upload] not defined. Error

It looks like you are trying to access a route that is not defined in your routes file. You will need to define the route in your routes file before you can access it. For example, if you wanted to access a route called user.id.upload, you would need to add the following to your routes file:

Route::get('user/{id}/upload', 'UserController@upload')->name('user.id.upload');

This will create a route that you can access with the name user.id.upload. You can then use this route in your controller or view.