Whenever you upvote a file (most likely, it'll be a picture) on reddit, it saves it on your OneDrive. Sorts by subreddit.
Then
Add file from URL
This Action will download a file at a given URL and add it to OneDrive at the path you specify. NOTE: 30 MB file size limit.
ID Bzj3SyDB
Explore more great ways to automate reddit and OneDrive