Same here, I followed every tip I could find here and on other websites, but still the folder / files are not showing up visibly.
Problem: ubiquitous container works, files can be read and written, but are not showing up in macOS Finder, nor in the Files app on iOS devices.
macOS 11.5, iOS 14.7, Xcode 12.5.1
I have tried:
everything stated here: https://developer.apple.com/library/archive/documentation/General/Conceptual/ExtensibilityPG/FileProvider.html
everything stated here: https://developer.apple.com/library/archive/qa/qa1893/_index.html
every variation of info.plist values for NSUbiquitousContainers (eg. both the container id and my bundle id)
every variation of info.plist values for NSUbiquitousContainerIsDocumentScopePublic
every variation of info.plist values for NSUbiquitousContainerName
every variation of info.plist values for NSUbiquitousContainerSupportedFolderLevels
creating new containers
changing the apps' version and build numbers, including only increasing CFBundleShortVersionString.
changing the apps' bundle identifier
deleting and reinstalling the app
reboots of used devices
switching off/on iCloud drive for the user on all devices
It is driving me crazy. Who can help?