You are able to subscribe to any RSS feed, incliuding Substack, and Ayrshare will automatically post all new articles and entries. New entries are checked for every 5 minutes.
Start by adding your RSS feed in the "RSS Feed" section of the dashboard. Find the RSS URL of your site by either Googling or adding /rss or /feed to the end of the URL.
Be sure the URL begins with http:// or https://
Once added you will see it listed in the Active section.
You can delete the feed by clicking on the red trashcan or see the main site by clicking on the URL.
You can add and delete RSS feeds with the API. Please see the endpoint.
Ayrshare also allows you to integrate with YouTube channel to automated posting. In the dashboard click on "YouTube Channels".
Next, go to YouTube and select a channel. Copy the channel URL. For example: https://www.youtube.com/c/TomScottGo
In the dashboard, paste this URL into the "Add a YouTube Channel".
Click Add YouTube and the YouTube Channel feed will be added. New YouTube videos posted to this channel will automatically post to your active social networks.