Attachments missing on iOS 14 when using MFMailComposeViewController

Hello,
I use MFMailComposeViewController to generate an email from my app. I add attachments through the function addAttachmentData(Data, mimeType: String, fileName: String) available on that class.
Everything works fine...unless you define a different default mail client on iOS 14. If I define Gmail or Outlook, the attachment is missing. If I define the Mail app, the attachment is present...
I suspect this is a pretty bad bug on iOS 14. Am I missing something? Nothing I could find in the MFMailComposeViewController indicates that adding attachments would only work if the Mail app is the default mail app on iOS 14.
Attachments missing on iOS 14 when using MFMailComposeViewController
 
 
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