All songs are an MP3 format. I do notice a different icon before the ones that will not import. All have been synced and are in my OneDrive file. At a loss to figure this out.

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    ModalD All have been synced and are in my OneDrive file.

    When you say synced , what do you mean by that?
    Perhaps you have done something to the mp3 file that does not comply with ST3 and that’s why the message.
    I always load a basic normal audio file and do text sync within ST3 without any problems .

      Damir uploaded. I suspected that OneDrive might be unfriendly to the audio mp3 files for some unknown reason so I moved all the files to iCloud and the problem seemed to resolve itself. Don’t know why but if it fixed the issue, I’m happy to have a working system.

      I've found that using OneDrive on an iPad as an intermediatry for getting audio files into ST3 to be... 'quirky'. I assume that to be an iOS 'quirk'.

      Even if you've put them into a OneDrive folder on another device (e.g. a PC where you've created/edited them), you need to make sure that OneDrive on the iPad is downloading the files. ST doesn't like (it might be all iOS apps, I don't know) the 'offline' versions that OneDrive exposes to the UI.
      When in doubt, go into the OneDrive app, open the folder in question, and see if you can open the files in a local media player app. Once you can do that successfully, go back into ST and try again. There's a pretty good chance it will work fine.