When we drag and drop a document, we have no option to create a new version.
Also we need to make sure that if a new version is create and WRE is in use, we can tap in the WRE new version process.
So basically we have two options to create a new version
Use the WRE - Revise
Drag and drop which will launch the WRE revise action and the file will be replace with the new one.