In Goolge Drive, File Overwrite, Replace is somewhat difficult.
This is a tool that allows you to overwrite, replace existing files in Google Drive™. instead of creating new file.
You can upload and update one file or multiple files. 

This does not compare the contents of files before overwriting, it only compares filenames.
Supports seamless large file, multiple files upload.

This app also provides the feature to modify the mime type. You can fix the wrong mime type of your Drive file.

Provides connect with Google Drive™. You can directly overwrite, replace files with your drive.