1. If I open a file using the file picker in an app, can the app now see all files in that folder?
  2. Is there any other way in which an app might see all the files in my iCloud Drive?
  • What if the answers to these two questions are different / not related? Are you looking for an off-site resource that answers the security model or perhaps want to choose one of these to ask first and push the second question to a second question (linked here if needed)? – bmike Mar 26 at 3:12

UIDocumentPickerViewController provides apps with open or import access to one or more user-specified files. Folders are not provided to apps for their own access to, and multiple selections must be user-initiated. When an app saves a file, it can retain access to that file but is not granted general access to the containing folder. Apps have access to their own app folders in iCloud Drive, but not the ability for any folder or all files.

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