Also, at Apple’s request, we had to remove the ability to “Send” files to other services, including iCloud Drive.
In short, we’re told that while Transmit iOS can download content from iCloud Drive, we cannot upload content to iCloud Drive unless the content was created in the app itself. Apple says this use would violate 2.23 – “Apps must follow the iOS Data Storage Guidelines or they will be rejected” – but oddly that page says nothing about iCloud Drive or appropriate uses for iCloud Drive.
If you’re an iOS developer and you still get upset over Apple’s App Store policies, there’s only one person to blame, and it isn’t Apple. You knew what you signed up for.