How can I upload a file to a case by inputting a full file path instead of choose a file in dialog?

As-is file uploading operation of our application:

 - Press Upload button

 - A standard Window file selection dialog pop up

- Choose a file, then confirm

Now, per a requirement of robot, we want uploading file to a case with a local file path, e.g. C:\folder\file.txt, that input as a text field.

May I know any OOTB / suggested solution for this requirement?

Thanks.