I wrote a shortcut to create a note in Obsidian for me to write up show notes for a podcast episode. It does everything right except the naming of the file in my Vault. Where it’s supposed to be named “Episode 226 - .md” it gets saved as “# Episode 229/.txt” which of course can’t be seen by Obsidian without changing the name in Finder. Here are the steps in Shortcuts. What am I doing wrong?
I don’t have an answer but maybe one of these actions can help. Unless, of course, you’re already using this. 
“Actions For Obsidian” from the Apple App Store might work for you. The “Save” action allows you to add a suffix to the file you’re adding to Obsidian. There is a 14 day trial to see if it works.
I have success with this by using the “Append to text file” action and including the .md in the specified path. (This creates files if they don’t exist already)