XLSX Office 2007 documents do NOT version correctly

When uploading new versions of a Office 2007 Spreadsheet the previous version will be returned from the "current" file link. You have to upload the file twice to actually see your changes reflected in the version.

1. Upload a .xlsx file.
2. Make a change to the .xlsx file and upload it again to create a new version with the same filename
3. Open the most current version and it will still be the old version.

• You have to upload it again and then click on the previous version and you will finally see the changes.

Very frustrating. I thought It just creates copies of the file and renames the old ones for backup.