Loading presets after plug-in restarted

MacOSX and iOS
1

Hi,

My AUv3 plug-in can only load presets that were saved during the current session. Once the plug-in is restarted, the sandbox process within iOS blocks read access. I’ve gone through previous forum posts on presets and I believe I’ve incorporated all of those fixes. Does anyone have some insight?

File chooser code:

juce::File customPreset = juce::File::getContainerForSecurityApplicationGroupIdentifier("group.com.identifier");

loadChooser = std::make_unique<juce::FileChooser>("Load Preset", customPreset, "*.aupreset", true, false, this);

auto folderChooserFlags = juce::FileBrowserComponent::openMode | juce::FileBrowserComponent::canSelectFiles;
loadChooser->launchAsync(folderChooserFlags, [this](const juce::FileChooser& fc) {
    if (fc.getURLResults().size() > 0) {
        auto file = fc.getURLResult();
        // Read directly into memory
        juce::MemoryBlock mb;
        file.readEntireBinaryStream(mb);
        // Assign state to plugin
        audioProcessor.setStateInformation(mb.getData(), mb.getSize());
        }
 });

void CosmicGuitarAudioProcessor::setStateInformation (const void* data, int sizeInBytes)
{
    std::unique_ptr<juce::XmlElement> xmlState (getXmlFromBinary(data, sizeInBytes));
    if (xmlState.get() != nullptr){
        if (xmlState->hasTagName(tree.state.getType())) {
            tree.replaceState(juce::ValueTree::fromXml(*xmlState));
        }
    }
}

Looking through the console during testing I see that iOS is denying read access to the shared group container:

Sandbox: CosmicGuitar(888) deny(1) file-read-metadata /private/var/mobile/Containers/Shared/AppGroup/6B863248-B4FD-4336-A770-8ABB61737381/File Provider Storage/Test22.aupreset
Sandbox: CosmicGuitar(888) deny(1) file-read-data /private/var/mobile/Containers/Shared/AppGroup/6B863248-B4FD-4336-A770-8ABB61737381/File Provider Storage/Test22.aupreset

This is on a 9th gen iPad running iOS 17.4.1

Thanks!