Substack, a newsletter monetization platform, has announced it's working on video uploads in private beta.

The company said in a blog post that the new feature — which is available to selected users so far — allows creators to upload or record videos directly into a Substack post:

You can then make videos available to everyone or only paid subscribers. The videos will be playable directly on the web in your Substack post, and they will appear in the email versions as clickable images.

Substack plans to roll out video player to everyone "in the coming weeks," getting feedback from a group of creators at the moment.

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One of the testers is songwriter Patti Smith, who published a video of herself performing a piano version of her song "Peaceable Kingdom."

According to the Substack help center, the video types accepted are 3GP, AAC, AVI, FLV, MP4, MOV, MPEG-2 and the maximum file size is 20 GB.