Google Drive API V3 - Copy function not copying contents - google-drive-api

Question

I've been working on a project to 'duplicate' a Team Drive. I've got the application successfully recreating the entire drive structure and copying files who's mimetype is not a Google folder. My issue is that the contents of copied files are not being copied as well.
I'm using Node for the application, with the Google Drive API SDK.
await drive
.files
.copy({
fileId: file.id,
supportsAllDrives: true,
requestBody: {
name: Mustache.render(originalFile.name, data),
driveId: driveId,
parents: [
parentId
],
mimeType: originalFile.mimeType
}
})
.then(res => {
newFile = res.data;
})
.catch(e => {
logger.error("Issue copying a file: ", e);
});
So while the above functions as expected (adjusting the name of the new file, putting it in the correct parent folder, under the correct new drive ID), there is no content in these copied files.
For a more specific example, let's say that one of the files I'm copying is a PDF. The new PDF with the correct mimetype shows in my new Team Drive, but when opening it (in browser, or downloading), there's nothing at all there. See some screenshots for what I mean.
Original Drive and file, note the size:
New Drive file, with no size/content:
Edit1:
I tried using the API explorer as a proof of concept again. It works as expected, copying the content. Tried it twice, first to the same folder in the same Team drive, then created a new team drive with a subfolder. Content copied fine in both cases.
In the case that it matters, here's the request for creating the new drive as well. requestId is just a random guid using the Chance repo.

Answer 1

The only error source I can imagine is mimeType
You do not need to specify the mimeType if you only want to copy a file without converting it.
Try a simple request without the request body:
drive.files.copy(
{
fileId: file.id,
requestBody: {}
},
(err, res) => {
if (err) return console.log(("Issue copying a file: " + err);
newFile = res.data;
console.log(newFile);
}
);
Once you confirm that it works correctly, add parameters one by one.