- The FHIR bundle size limit is 500 resources. As you are loading the Synthea data, you can use FHIR bulk loader github repository, which splits the bundles into smaller chunks.
- FHIR bulk loader git repository should be helpful to load the data. you don't need to upload using POSTMAN
Can you share how you are loading this volume of Synthea data, is it for testing purposes? are you aware of AHDS , and why choosing Azure API for FHIR over AHDS?
Regards
Geetha