How to add podcasts manually to the new Podcasts.app on macOS Catalina I'm on macOS Catalina (10.15 Beta (19A471t)), and I'm trying to add manually downloaded podcasts that I copied from an iTunes library to the new Podcasts.app.  

I tried to simply drag the files into the ~/Library/GroupContainers/243LU875E5.groups.com.apple.podcasts folder (- location of all the downloaded podcasts), but after that, the files still aren't appearing in the app.  

I can see that the downloaded files in the mentioned podcasts folder have special file names (e.g. 7BE50452-8412-4232-B384-D9E1B94813ED.mp3).

Downloading again the files within the Podcasts.app, is not always a solution, As @Dillon pointed out in the comments.

Is there any solution for this issue?
From what I found there is no way to add an audio file into Podcast application: as of macOS Catalina, it supports only subscribing to RSS feeds. The only way built-in way to listen to the separate podcast episode is to find it via application search and add it separately.

However, I found out that you can listen to any audio files including MP3 the same way you did in Podcasts in Books application by adding them there via File -> Add to Library... and then syncing them to iPhone.