Drive Settings to Maintain Formatting of Documents:
Often times a document that is created in a non-Google format needs to be loaded to Drive for sharing. But, it needs to be kept in the original format so it can be downloaded and used again in its original format.
Setting Google Drive properties to not auto convert the document can help manage this.
In Drive upload settings choose the option to confirm converting to Google Docs format.
Then, when uploading the document, choose not to convert.