终于，2 天后我找到了我的答案，我想在这里为每个可能遇到同样问题的人提供我的答案.

Finally, after 2 days I found my answer and I would like to provide my answer here for everyone who maybe has the same problem.

为了使路由绑定起作用，您应该让类型提示的变量名称与路由段名称匹配，如文档要求:

For route binding to work you should have type-hinted variable names match a route segment name, as the doc required :

例如我的编辑方法

这里是我要编辑的路由 URI

Here my route URI for edit

admin/file/{file}/edit

如您所见，有 {file} 参数或您调用的任何内容现在只需要在函数参数中准确地写$file

As you can see there is {file} parameter or anything you call now just need write exactly $file in function parameter

public function edit(Files $file)
{
   return view('admin.edit',compact('file'));
}