The problem is that Apple changed the API a bit for the file open dialog. Whereas before they allowed people to select folders with it they no longer do. OMZ will need to add the open folder dialog to the app as well for it to work properly. The author of Textastic is having to do the same thing and that app should be updated by the time iOS 13 is released. I doubt Pythonista will have the same luck.

Also, I thought I could only create new files in Working Copy, not in Pythonista, because if you add a tab, then select New file..., Working Copy directories are not visible.

But then I noticed that if I first navigate to the right Working Copy directory in the left panel file browser, and then select ’+’ at the bottom, I can add the file in Pythonista.

@JonB @cvp

First, thanks for both responding!
To answer the questions you both bring up:

It does need to be done programmatically, this is for picking a folder from within a running UI.

The Files sheet UI definitely seems to be able to pick a folder...at least, I've seen other apps use it for that purpose. Even pythonista itself can select a folder from the Files sheet for import and other things.

If it's just that pick_document() is restricted to only picking files, and cannot pick folders, that's what I'd want to know.

@TutorialDoctor

I've actually stumbled across a temporary solution using github pages, Editorial, and Working Copy that may end up providing what I need.

Thanks for the reply!

Sorry, was stupid mistake not reading correctly. Is the section to create extensions :( was thinking about file extensions. Opps