The basic implementation of the addFileAttachmentAsync is as follows:

Office.context.mailbox.item.addFileAttachmentAsync(
  fileURL,
  selectedAttachment.name,
  {},
  (result) => {
    console.log('error or success')
  },
);

Now this works. If I call this multiple times for multiple files, it works. All the files get uploaded. But one problem. The callback gets fired only once. Let's say there were two files and both files throw errors. I'll be able to read the error of only one file. How can I fix this and make the callback run for all executions separately?

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