Cannot select Cryptomator folder in SwiftUI file importer

[nickasd]

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• I have searched existing issues for duplicates
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Summary

The SwiftUI file importer doesn't allow to select folders in a Cryptomator vault

System Setup

• iOS: 18.0
• Cryptomator: 2.6.2

Cloud Type

iCloud Drive

Steps to Reproduce

1. Run a SwiftUI app with the following content:

struct ContentView: View {
    @State private var isPresentingUrlPicker = false
    @State private var label = ""
    
    var body: some View {
        VStack {
            Button("Open") {
                isPresentingUrlPicker = true
            }
            Text(label)
        }
        .fileImporter(isPresented: $isPresentingUrlPicker, allowedContentTypes: [.folder, .data]) { result in
            do {
                let url = try result.get()
                let _ = url.startAccessingSecurityScopedResource()
                label = url.path
                url.stopAccessingSecurityScopedResource()
            } catch {
                label = error.localizedDescription
            }
        }
    }
}

2. Tap on the Open button.
3. Select a folder in a Cryptomator vault.

Expected Behavior

The Open button of the file importer should be enabled.

Actual Behavior

The Open button of the file importer is disabled.

Reproducibility

Always

Relevant Log Output

No response

Anything else?

I cannot reproduce the issue myself since I don't have Cryptomator for iOS. I became aware of this through a customer of my app which allows to select folders.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[nickasd]

Is this not going to be looked at? Should I do anything?

[tobihagemann]

Closing as duplicate of #51. The underlying cause is that the File Provider extension does not support the undocumented NSExtensionFileProviderSupportsPickingFolders key, which prevents folder selection from third-party apps.

[nickasd]

Thanks for looking into this. From your comment I'm not sure we're talking about the same thing: you mention "prevents folder selection", but in the current issue it's about not being able to select the root folder, subfolders on the other hand work.

Even if you actually meant the root folder, I reported the same issue to a company in the past by replicating it with the sample code from Apple: https://developer.apple.com/documentation/FileProvider/synchronizing-files-using-file-provider-extensions

The sample code allowed me to create a file provider and I was able to select its root folder within my app’s file importer (see code in my original post). In the other ticket #51 some undocumented Info.plist key NSExtensionFileProviderSupportsPickingFolders is mentioned, but that doesn't seem to be used in the sample code. Could you have a look?

[DSMasterson]

I'm interested in seeing Beorg be able to access Cryptomator vaults. The problem seems to be this issue. The result seems to come down to (so far) Cryptomator not supporting an undocumented "PickingFolders" key because it bypasses a Cryptomator FileExtension. My question is how does Cryptomator integrate with the Files App such that it avoids this issue? What is different about the Files App accessing any other virtual/network filesystem and Cryptomator?