[Bee]

Thanks Mike, 

Yesterday I was able to export a different song to OneDrive, but still had problems with the same message on tht first song I had tried. Just now I tried to export that first song again, to see what might happen, and it worked! Fourth time lucky. 

I went to the folder you listed, and a song I successfully emailed yesterday was still there. I tried exporting it to OneDrive and got the same error message about overwriting, but this time clicked on export instead of cancel. It exported properly and the temp file had disappeared. At least I know what to do now if the problem recurs. 

Thanks for your time. 
Cheers
Bee