SwiftUI sharing application data using pasteboard - swiftui

Question

I have a phone / iPad application. It would be useful to export text, images, or other data to other apps or other devices.
I can export the colour data as text using UIpasteboard.general.string. This works nicely. The Universal pasteboard lets me paste into other devices.
I can export an image using UIpasteboard.general.image. I have a PNG image in my bundle resources. I can the paste it into Preview or some other image viewer. I would like to be able to paste it as a file but I can't see how to do that at the other end.
I have also a PDF manual in the Bundle. It would be nice to export that too. Like the previous image, it would be nice to paste it as a file but I cannot see how this is done.
Before I get into the code, is UIpasteboard the right way to do this? Or is there some other approach I ought to be using rather than trying to fix this. What do other apps do?
Grid(horizontalSpacing: 3, verticalSpacing:3) {
GridRow {
Text("Text: ").gridColumnAlignment(.trailing).foregroundColor(.gray)
Button {
let pasteboard = UIPasteboard.general
pasteboard.string = toString(sw: sd.mySwatch)
} label: {
Text("Current swatch").lineLimit(1).frame(width:buttonW)
}.buttonStyle(.bordered)
}
GridRow {
Text("Text: ").gridColumnAlignment(.trailing).foregroundColor(.gray)
Button {
var reply: String = ""
for sw in sd.swatches {
reply = reply + toString(sw: sw)
}
UIPasteboard.general.string = reply
} label: {
Text("All swatches").lineLimit(1).frame(width:buttonW)
}.buttonStyle(.bordered)
}
GridRow {
Text("Image: ").gridColumnAlignment(.trailing).foregroundColor(.gray)
Button {
UIPasteboard.general.image = UIImage(contentsOfFile: Bundle.main.path(forResource: "Macbeth", ofType: "png")!)
} label: {
Text("Macbeth.png").lineLimit(1).frame(width:buttonW)
}.buttonStyle(.bordered)
}
GridRow {
Text("PDF: ").gridColumnAlignment(.trailing).foregroundColor(.gray)
Button {
UIPasteboard.general.url = Bundle.main.url(forResource: "ByEye", withExtension: "pdf")!
} label: {
Text("ByEye.pdf").lineLimit(1).frame(width:buttonW)
}.buttonStyle(.bordered)
}
}
That is my code. The first three options work. The last one does not because the URL is a private one for the application. I might be able to copy the file to a public directory so the URL worked but that seems like the wrong way to go about it.
Postscript:
This actually works well enough for now. I can copy stuff to the pasteboard, then paste it into an e-mail or other message to myself. This lets me get stuff out of the app without creating temporary files the I have to clean up.
I did not find a solution for the PDF or other files. I was hoping for something like this...
UIPasteboard.general.file = UIImage(contentsOfFile: Bundle.main.path(forResource: "manual", ofType: "pdf")!)
...but nothing like that exists as far as I can tell.