Reddit Any new post in subreddit. Google Drive Upload file from URL.

Save newly added /r/Wallpapers images to Drive for ChromeCast Backdropping

Connect

Insert a subreddit that you want the images from, and enable the "Show Drive photos and videos in your photo library" option in your Google + settings. Set the folder that you've created as the only BackDrop in your ChromeCast settings and you're done!

More on Google Drive and Reddit

About Google Drive

Google Drive lets you store and access your files anywhere — on the web, on your hard drive, or on the go. Applets let you send the most important information into your Google Drive, automatically.

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About Reddit

Reddit is a social news website. Turn on Applets that help you discover and save the best content from "the front page of the Internet," and quickly and easily create your own posts.

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More integrations with Reddit