mime varieties – Getting UIDocumentPickerViewController to solely enable the number of binary information recordsdata on iOS 13

My app is caught at iOS 13 in the interim, and I can not get the UIDocumentPickerViewController solely to permit the number of binary recordsdata.

That is what I am placing into my data.plist

<key>UTExportedTypeDeclarations</key>
<array>
    <dict>
        <key>UTTypeIdentifier</key>
        <string>public.firmware</string>
        <key>UTTypeDescription</key>
        <string>Firmware Binary</string>
        <key>UTTypeIconFile</key>
        <string></string>
        <key>UTTypeConformsTo</key>
        <array>
            <string>public.information</string>
        </array>
        <key>UTTypeIconFiles</key>
        <array/>
        <key>UTTypeTagSpecification</key>
        <dict>
            <key>public.filename-extension</key>
            <array>
                <string>bin</string>
            </array>
            <key>public.mime-type</key>
            <string>utility/octet-stream</string>
        </dict>
    </dict>
</array>

This is what I am hooking as much as a button upon choice

let vc = UIDocumentPickerViewController(documentTypes: ["public.firmware"], in: .import)
    vc.delegate = self
    
    self.current(vc, animated: true)

I would use UTType nevertheless it’s not accessible in iOS 13. Additionally, I am unsure if I am utilizing the right mime-type. I selected octet-stream from this record https://developer.mozilla.org/en-US/docs/Net/HTTP/Basics_of_HTTP/MIME_types/Common_types