My problem is: if I call https://graph.microsoft.com/v1.0/sites/{site-id}/drives/{drive-id}/root/children
all I get are the top-level items of that drive.
I found that the below endpoint retrieves all files and folders in a library. The result will be paged, with a standard page size of 200 items.
/drives/{drive-id}/list/items
There's no endpoint to get all items in a drive with every file from every subfolder at once.
Below endpoint maps to a test library MyDoc3.
/sites/siteid/drives/{drive-id}
Then, below endpoint use to get children of FolderA
in MyDoc3.
/sites/siteid/drives/{drive-id}/root:/FolderA:/children