Opening files in the book file

InDesign
1

I’m trying to open the individual files from an indb file. I’m able to open that book file, and then I’m not able to resolve the files to open them.

// Iterate over each document in the book
    for (let i = 0; i < bookContents.length; i++) {
      const bookContent = bookContents.item(i);
      console.log(`Processing document: ${bookContent.name}`);

      // Open the .indd file
      // verify the bookContent.filePath Promise is valid, and log if it is not.
      bookContent.filePath
        .then((doc) => console.log(`Document: ${doc.name}`))
        .catch((err) => console.error(`Promise Error: ${err}`));

      
      const filePath = bookContent.filePath;

But the promise is never resolved, and I can’t get it to do so, if I add an awaite, like

const filePath = await bookContent.filePath;

it just throws an error immediately.

Should this work? Has anyone done this before? If I double inDesign can open the files fine. So It’s something with permissions or my script.

Thanks for any help.

Note the then/catch is just me trying to figure out why it’s not working.