Can I previews proprietary RAW file formats in Microsoft's OneDrive?

I'd like to use Microsoft's OneDrive as a back up for my Olympus and Nikon RAW images.  I don't plan to edit via OneDrive (in Lightroom or Photoshop) but upload and download large batches of images as needed.  First question 1) Does MS OneDrive support the basic upload / down load of proprietary RAW files images and 2) Can I preview thumbnails of the RAW files in OneDrive?  If not - can I tweak something to make it work?  Thanks so much!