Failed to add a new subscription for my own onedrive 'Documents' folder - onedrive

Question

I have failed to add a new subscription webhook URL for my personal one drive Documents folder ( not a business account). The request response details is as follows.
URL: https://graph.microsoft.com/v1.0/subscriptions
Try 1
Request JSON:
{
"notificationUrl": "https://****.rest/OneDrive/newItemWebhook",
"expirationDateTime": "2017-09-18T11:23:00.000Z",
"resource": "/me/drive/root/Documents",
"changeType": "updated",
"clientState": "client-specific string"
}
Response JSON:
{
"error": {
"code": "BadRequest",
"message": "Unsupported segment type. ODataQuery:
users/****#outlook.com/drive/root/Documents",
"innerError": {
"request-id": "169755ee-bdf5-460e-8577-6f1e22777207",
"date": "2017-09-18T10:46:07"
}
}
}
Try 2
Request JSON:
{
"notificationUrl": "https://****.rest/OneDrive/newItemWebhook",
"expirationDateTime": "2017-09-18T11:23:00.000Z",
"resource": "/me/drive/root:/Documents",
"changeType": "updated",
"clientState": "client-specific string"
}
Response JSON:
{
"error": {
"code": "InvalidRequest",
"message": "resource '/me/drive/root:/Documents' is not supported.",
"innerError": {
"request-id": "403229b0-0554-46c2-82b8-ede69a4ef9a2",
"date": "2017-09-18T10:50:36"
}
}
}
In both cases the cases the failed to add subscription webhook URL but the reason in unknown to me, means what is :
Unsupported segment type. ODataQuery
resource '/me/drive/root:/Documents' is not supported.
and then if I want to set webhook URL for the above mention "resource" then what will be the path for my case!

Answer 1

Apparently, you cannot subscribe to changes in the particular folder, but to a drive, so you should subscribe to /me/drive/root. Then you could use driveitem delta api to track changes: https://learn.microsoft.com/en-gb/onedrive/developer/rest-api/api/driveitem_delta or use your own method (i.e. list files in the Documents folder)
Here is a bit outdated video explaining the process: https://channel9.msdn.com/Events/Build/2016/P566