Hi! I posted an answer to this in your Stack Overflow question, duplicating here in case someone finds this before SO:
You need to use fileExporter with documents argument instead of document, which takes in a Collection
macOS example:
import SwiftUI
import UniformTypeIdentifiers
struct ImageDocument: FileDocument {
	static var readableContentTypes: [UTType] { [.jpeg, .png, .tiff] }
	var image: NSImage
	init(image: NSImage?) {
		self.image = image ?? NSImage()
	}
	init(configuration: ReadConfiguration) throws {
		guard let data = configuration.file.regularFileContents,
					let image = NSImage(data: data)
		else {
			throw CocoaError(.fileReadCorruptFile)
		}
		self.image = image
	}
	func fileWrapper(configuration: WriteConfiguration) throws -> FileWrapper {
		/* You can replace tiff representation with what you want to export */
		return FileWrapper(regularFileWithContents: image.tiffRepresentation!)
	}
}
@main
struct FocalApp: App {
	@StateObject var appContext = AppContext()
	var body: some Scene {
		WindowGroup {
			MainView()
				.environmentObject(self.appContext)
				.fileExporter(
					isPresented: $appContext.fileSaveDialogShown,
					documents: [
						ImageDocument(image: NSImage(named: "testimage1")),
						ImageDocument(image: NSImage(named: "testimage2"))
					],
					contentType: .tiff /* Match this to your representation in ImageDocument */
				) { url in
					print("Saved to", url) /* [URL] */
				}
		}
	}
}
the_max
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