Hi folks 👋 — I’m running GrowthBook on Kubernetes and using GCS for uploads. Backend is configured with:

UPLOAD_METHOD=google-cloud
GCS_BUCKET_NAME=growthbook-bkt

GCS access and Workload Identity are working (I can run

gsutil ls

successfully from the backend pod). However, when I try to upload a file from the web UI (e.g. in an experiment), I consistently get:

Failed to upload file: Direct uploads are only supported for local storage. 
Use /upload/signed-url-for-upload for cloud storage.

From the backend logs I can see the frontend is calling:

PUT /upload

and the backend responds with that error. Example log:

method=PUT url=/upload
msg="Direct uploads are only supported for local storage. Use /upload/signed-url-for-upload for cloud storage."

So it looks like the UI is still attempting the legacy direct upload flow instead of calling:

POST /upload/signed-url-for-upload

Backend and frontend image is

4.3.0

. Question: Is there any frontend config or version requirement to enable the signed-URL upload flow for GCS? Any pointers on what controls the switch away from

PUT /upload

would be really helpful. Thanks in advance.

Let me share this with the team.