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Lightroom informs that "the file couldn`t be export"
Tell us the complete, unedited, word-for-word error message. Also please state the version NUMBER of your Lightroom and please state the version NUMBER of your operating system. Do not use words like "up-to-date" or "current".
Welcome to the forum, as DJ says more info. See the screen capture from the forum guidelines.
Are youu using Smart Prieviews?
If so, wherevis the original photograph?
Is the photograph on an external hard drive?
Is tgat external hard drive connected, on?