How to only open email app and attach a file? - flutter

Question

I'm trying to only OPEN an email app i.e. Outlook, Gmail, etc. and with an attachment already attached. Ready for the user to write a subject and send it to someone. Again I'm not looking to send it automatically, only open the app with the attachment attached.
So far the only thing I found is this: https://pub.dev/packages/launchers
But I am getting an error message: "No implementation found for method send on channel GitHub.com/sunnyapp/launchers_compose"
Here is my code: I am at a loss. I feel like this should be an easy thing to do. P.S most email openers can open an email app but can't attach attachments. I also know this is for mobile only. Android and iOS.
final Email email = Email(
body: "This Email was Created by TRS to send an Excel File!",
subject: "$excelName",
recipients: [""],
attachmentPath: fullPath,
);
Iterable<String> platformResponse;
try {
final results =
await LaunchService().launch(composeEmailOperation, email);
print(results);
platformResponse = results.allAttempts.entries.map((entry) {
print("Provider = ${entry.key}\nResult = ${entry.value}");
return "P";
});
} catch (error, stack) {
print(error);
print(stack);
platformResponse = ["Error: $error"];
}

Answer 1

You can use https://pub.dev/packages/share_plus package:
String filename = './docs/myfile.xlsx'
Share.shareFiles([filename], text: 'This Email was Created by TRS to send an Excel File!');
This opens gmail or whatever app you have with attachment and text but this particular code only works on mobile, not on desktop. I