In DPP, if the image displays correctly, the file’s orientation flag is usually already set correctly. When you use Convert and Save, DPP should normally preserve the orientation it is showing.

A few things to check:

• Make sure the image is actually upright in DPP before exporting.
• Canon auto-rotate typically works for portrait orientation, but may not detect a camera held completely upside down.
• Update DPP to the latest version, since older versions may behave inconsistently.

Also note that the problem may be with the program you use to view the exported file, not with DPP. Some older Windows image viewers (such as those in Vista/Windows 7) do not always honor the orientation metadata, even though DPP does.

If a specific image was shot fully upside down and auto-rotate didn’t identify it, you may still need to rotate that image manually before saving.