File upload and extraction failed in Sandbox app

Hi everyone, I have implemented a file upload option and then extracting that file content into a location ( deployment → web → my_custom_folder_name ).  In local I am able to upload that file and extract the file contents into that location. After completing the implementation i have published app . Now I have tested from the published sandbox app , the same file upload action getting failed. Is anyone know why this error in sandbox app. Is there any limitations in sandbox environment   
1 answers

No, the problem with that setup is that when you run your app in the cloud, the server can’t acces a folder on your local machine