#53 most commondatabaseLovableBolt.newCursorWindsurf

Storage: Bucket not found / upload blocked

StorageApiError: Bucket not found / 403 Unauthorized new row violates row-level security policy (storage upload)

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What it means

Your app tries to upload or show files from a storage folder ('bucket') that either doesn't exist under that name or doesn't allow this user to upload.

How to fix it: paste this prompt into your AI builder

Fix prompt for Lovable, Bolt, Cursor, Windsurf
My Supabase Storage upload fails. Check the bucket name the code uses matches an existing bucket exactly; if it doesn't exist, give me SQL to create it (public or private as appropriate). Add storage.objects policies for that bucket: INSERT (and SELECT) for authenticated users, ideally limited to a folder named after their user id. Don't make private files public and don't change other code.

If the AI can't fix it: manual steps

  1. Supabase dashboard, Storage: confirm the bucket name and whether it's public.

Where this happens

Seen in these AI app builders and editors:

LovableBolt.newCursorWindsurf

Sources

Related database errors

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