It's been over two years since I last raised a tracker item (#105932) to highlight that the Collaborate API does NOT have an endpoint for determining the iSheet item ID for a folder meta-data iSheet.
And so we haven't used Folder iSheet's in ANY solution because of this...
- Here is the one for File meta-data iSheet:
https://collaborate.highq.com/sitepoint/showSwaggerUI.action#/ISheet%20API/getIsheetRecordID - Here is the one for Task meta-data iSheet:
https://collaborate.highq.com/sitepoint/showSwaggerUI.action#/ISheet%20API/getIsheetRecordIDFromTaskID - Here is the one for Folder meta-data iSheet:
...? MIA