@bill.clifford , thank you so much for your time getting back to me. For example, I have been trying to get all GS URL(s) of a specific patient with the ID. Let’s say 100_HMXXXXX. It is time-consuming to keep iterating over until the records found. The cohort file that I exported and saved from IDC did not have information of GS URL(s). I believe the author of this post Using API to get images for a particular TCGA patient barcode having the same issue that I have.