In Bridge CC 2017 7.0, when you drag raw images from the Content panel onto the Publish panel to upload to Adobe Stock, the Unable to Upload All Assets dialog displays the following error message:
Your selection contains assets that cannot be uploaded to Adobe Stock. Assets are in an unsupported format.
When you drag a raw image from the Content panel onto the Publish panel, Bridge converts the raw image to JPEG for uploading on Adobe Stock using the Camera Raw plugin. Only those raw image formats that are supported by Adobe Camera Raw are converted to JPEG.
To find out if Adobe Camera Raw supports your camera model, see Cameras supported by Camera Raw.