Problem
After navigating to the CSV File Upload page for a data source, the list of Datasets is incomplete. I see only my most recent dataset but none of my older datasets. If I then add a new dataset, the older one drops from the list, and only the new one is shown. I first noticed the problem on 2026-08-24 (it could have been introduced in the two weeks prior), and it has persisted.
Expectation
After navigating to the CSV File Upload page for a data source, I expect to see a list of all of the datasets for the chosen data source in the leftmost column labeled Datasets. In my case, I should see at least a handful.
Additional details
Here’s the relevant http request, which confirms only a single fileSet was returned in the response. My best guess is that a query behind that endpoint changed to something like ORDER BY createdTimestamp DESC LIMIT 1.
request url: https://datastudio.google.com/u/0/getFileSetsList
request body:
{"fileSetIds":\[\],"fileSetTypes":\[2\],"cmsFilesetId":"UUID"}
response body:
{"fileSets":\[{"fileSetId":"DATASET_UUID","title":"DATASET_TITLE","status":1,"createdTimestamp":{"seconds":"1787569298","nanos":879765000},"lastModifiedTimestamp":{"seconds":"1787569298","nanos":817804000},"type":2}\]}