I made an Overcast Upload shortcut that does a few things:
• Running the shortcut directly to launch the iCloud drive file picker for audio files (single or multiple selection)
• Running as a share sheet target for an audio file in any app
• Running as a share sheet target for a YouTube video (will download and convert the video to audio in the shortcut)
It’s incorporates some previous work I found on these forums as well as my own work to make it a single tap and I wanted to post my additions. (YouTube audio to Overcast)
I hope people find it useful.