Step-1: Go to C Drive in My Computer.
Step-2: Create the New Folder in C Drive with the name "fakepath".
Step-3: Copy the XML file which you want to upload.
Step-4: Paste that XML File in the fakepath folder which is created in C Drive.
Step-5: Now upload your Return on Income Tax Site and when you upload XML File, you should upload that file from the fakepath folder.