Please could you send us a copy of the restoration log?
This can be found in the ‘wp-content/updraft’ directory of your site via FTP.
The contents will be too long to post here directly, but you can use an online service such as Dropbox or Pastebin, and post the link here.
If you are not seeing any other errors, you can try restoring the Uploads manually. To do so, unzip the uploads backup file(s) on your local machine. Then, upload the unzipped contents to the ‘wp-content/uploads’ directory via FTP.