We had a very similar issue recently but with s3 presigned url uploads, cloudflare WAF and OWASP rules. Worked fine one day on 'high', next day started blockin

We had a very similar issue recently but with s3 presigned url uploads, cloudflare WAF and OWASP rules. Worked fine one day on 'high', next day started blocking random file uploads with a 'blocked by cloudflare page'.