Uploading items to a personal OneDrive shared folder - microsoft-graph-api

Question

OneDrive user A shares a folder with OneDrive user B, and B can access that folder by using the share id.
For example using the graph explorer
GET https://graph.microsoft.com/v1.0/shares/{shareId}
yields
{
"#odata.context": "https://graph.microsoft.com/v1.0/$metadata#shares/$entity",
"id": "{shareId}",
"name": "ASharedFolder",
"owner": { ... }
}
Now, B wants to upload a new file to ASharedFolder.
Reading the OneDrive docs for upload I have tried
PUT https://graph.microsoft.com/v1.0/shares/{shareId}/driveItem/children:/SomeFile.txt:/content
Content-Type text/plain
some text goes here
as well as
PUT https://graph.microsoft.com/v1.0/shares/{shareId}/items/{sharedItemId}:/SomeFile.txt:/content
Content-Type text/plain
some text goes here
but both yield "BadRequest", "Unsupported segment type..."
Edit: I have now played out this scenario in the OneDrive Web UI using two different browsers for OneDrive users A and B, so I know that it is possible (without first adding the shared folder to B's own root), but I need some help figuring out the right request for the OneDrive REST API.
Does anyone know?

Answer 1

I checked the possibility of uploading files to a shared folder on OneDrive belonging to another user. I did not have any problems to achieve it using GraphExplorer.
Here is what I did:
I got a list of shared files and folders:
GET /me/drive/sharedWithMe
Returned (some of the data has been omitted):
{
"#odata.context": "https://graph.microsoft.com/v1.0/$metadata#Collection(driveItem)",
"value": [
{
"#odata.type": "#microsoft.graph.driveItem",
"id": "<itemId>",
"name": "Folder name",
"parentReference": {
"driveId": "<myUserId>",
"driveType": "personal"
},
"remoteItem": {
"id": "<remoteItemId>",
"name": "Folder name",
"createdBy":
"user": {
"displayName": "Other user name",
"id": "<otherUserId>"
}
},
"folder": {
"childCount": 0
},
"parentReference": {
"driveId": "<otherUserId>",
"driveType": "personal"
},
"shared": {
"owner": {
"user": {
"displayName": "Other user name",
"id": "<otherUserId>"
}
}
}
}
}
]
}
Then I preformed PUT request with the following data:
PUT /drives/{otherUserId}/items/{remoteItemId}:/test.txt:/content
Content-Type: text/plain
The contents of the file goes here.
Response: Success - Status Code 201
{
"#odata.context": "https://graph.microsoft.com/v1.0/$metadata#drives('<otherUserId>')/items/$entity",
"id": "<itemId>",
"name": "test.txt",
"size": 35,
"createdBy": {
"application": {
"displayName": "Graph explorer"
},
"user": {
"displayName": "My user name",
"id": "<myUserId>"
}
},
"parentReference": {
"driveId": "<otherUserId>",
"driveType": "personal",
"id": "<parentReferenceId>",
"name": "Folder name",
"path": "/drives/<otherUserId>/items/<parentReferenceId>"
},
"file": {
"mimeType": "text/plain"
}
}
Then, on the subsequent GET /me/drive/sharedWithMe request, the value of the childCount of the folder has been increased to 1.
NOTE:
The \shares endpoint only allows GET requests to access a shared DriveItem or a collection of shared items. It does not allow to create new items.