Ordering via the admin is unsupported because there are more than 200 siblings

I'm migrating a website, in which the original content (from Drupal) had a flat structure. Thus, I've hit a limit that I didn't know existed.

Is there an alternative to renaming all of the folders by hand? Thanks.

No files, tests, or entry points are named. Start by locating the admin ordering flow that handles folders with more than 200 siblings, then compare it with the flat Drupal migration described here. Done means users can order this content without manually renaming every folder.

Written by the indexing model from the issue text.