It would be helpful to update a file type of a stored file (e.g., changing a .doc to a .docx which uses less storage space) without losing the metadata/edit history which is inherent by simply uploading the updated file type.

If not possible in the simple "edit" option, it would still be helpful if it could occur in the check-out/version process.

This is especially important where updating forms/samples because it is helpful (for internal process audits) to see who has made the changes to a form/sample, and when that happened. Conversely, it is better (for data/file management) to update stored files to the new file versions which occupy less storage space/memory.