1. **Refactor R2 Verification**: Separated bucket existence checks from CORS configuration in `r2Service.js`. Previously, if `HeadBucket` failed (e.g., due to CORS restrictions), the CORS configuration step was skipped. Now, CORS setup is attempted independently, increasing the chance of successful auto-configuration.
2. **Improve Error Messaging**: Enhanced error handling in `verifyPublicAccess` to detect "Failed to fetch" errors and explicitly suggest checking Cloudflare R2 CORS settings in the UI.
3. **Fix AWS SDK Import**: Consolidated the AWS SDK import fix to use the `?bundle` version from `esm.sh` in `r2-s3.js`. This prevents `fs.readFile` runtime errors by ensuring a browser-compatible build is loaded.