Google Drive API Upload to Parent Folder - google-apps-script

Question

I have a JavaScript based Google Apps script that iterates through all files in Drive and converts MS files to Google format. I am using Drive API to upload and convert. Everything seems to work fine, except when I have a file in a Drive sub folder. When the file is uploaded back to Drive, I cannot define a parent folder, so it goes directly to the root.
I have a handle on the parent folder ID, but when I add "parents : folderID" to the JSON String, I do not see any change in the upload path.
This is my upload and convert function, is there any way to modify this to define a parent folder? I'm totally lost with the API... Can anyone assist?
var uploadFile = JSON.parse(
UrlFetchApp.fetch("https://www.googleapis.com/upload/drive/v2/files?uploadType=media&convert=true",
{
method: "POST",
contentType: officeFile.getMimeType(),
payload: officeFile.getBlob().getBytes(),
parents: ['id' : folderID], <<<<<<<<<<<<<<<<< this line
headers: {
"Authorization" : "Bearer " + ScriptApp.getOAuthToken()
},
muteHttpExceptions: true
}).getContentText());

Answer 1

With V3 of the API the format of the parents parameter has changed (didn't seem to be listed in the documentation which always makes things fun). Parents are no longer added as {id:} objects.
var folderId = '0BwwA4oUTeiV1TGRPeTVjaWRDY1E';
var fileMetadata = {
'name': 'photo.jpg',
'parents': [ folderId ]
};
var media = {
mimeType: 'image/jpeg',
body: fs.createReadStream('files/photo.jpg')
};
drive.files.create({
resource: fileMetadata,
media: media,
fields: 'id'
}, function(err, file) {
if(err) {
// Handle error
console.log(err);
} else {
console.log('File Id: ', file.id);
}
});
Full documentation

Answer 2

I use v2 API with curl and succeeded to upload file in parent folder by writing meta json file with below format.
{
"title": "35_20190702.csv",
"mimeType": "text/csv",
"description": "Uploaded From Curl",
"parents": [
{
"kind": "drive#parentReference",
"id": ${FOLDER_ID}
}
]
}