how to save a form with a TextField and imagePicker into CoreData

I am learning SwiftUI by building an app that uses a form with a TextField and imagePicker. Used two sets of codes, TextField and imagePicker together but don't know how to consolidate saveImage with Add/Save Button of fileData.writeData to save both data of TextField and image into Core Data at same time. Here are the codes:

@ObservedObject var fileData : FileVM
@Environment(\.managedObjectContext) var moc
@Environment(\.managedObjectContext) var context

@State private var image: Image?
@State private var showImagePicker = false
@State private var inputImage: UIImage?
...
Form {
    HStack {
        Text("File Name:")
        Spacer()
        TextField("required", text: $fileData.fileName)
        ...
    }
    HStack {
        Text("Attachments: ")
        ...
        Button(action: { self.showImagePicker.toggle() }) {
            Text(" \(Image(systemName: "photo")) ")
        }
    }

    Button(action: saveImage) {  // the function of this button should consolidated in the Add/Save button below.
        Text("Save")
        ...
    }
...
Button(action: {fileData.writeData(context: context)}, label: {
    title: do { Text(fileData.updateFile == nil ? "Add" : "Save")

...

func saveImage() {
    let jpegPickedImage = inputImage?.jpegData(compressionQuality: 1.0)
    let fileimages = FilesEnt(context: self.moc)
    fileimages.fileImages = jpegPickedImage
    try? self.moc.save()
    print("Image is saved")
}

func loadImage() {
    guard let inputImage = inputImage else { return }
    image = Image(uiImage: inputImage)
}

func writeData(context : NSManagedObjectContext) {
    
    if updateFile != nil {
        updateFile.fileName = fileName
        updateFile.fileImages = fileImages

        try! context.save()
        updateFile = nil
        isNewData.toggle()
        fileName = ""
        fileImages = Data()
        return
    }
    
    let newFile = FilesEnt(context: context)
    newFile.fileName = fileName
    newFile.fileImages = fileImages

    do {
        try context.save()
        isNewData.toggle()
        fileName = ""
        fileImages = Data()
    }
    catch{
        print(error.localizedDescription)
    }
}

Thanks for help!