# Checklist
- [x] I have read the [contribution guidelines] (https://github.com/Azure/azure-iot-sdk-c/blob/main/.github/CONTRIBUTING.md).
- [ ] I added or modified the existing tests to cover the change (we do not allow our test coverage to go down).
- If this is a modification that impacts the behavior of a public API
- [ ] I edited the corresponding document in the `devdoc` folder and added or modified requirements.
- I submitted this PR against the correct branch:
- [x] This pull-request is submitted against the `main` branch.
- [x] I have merged the latest `main` branch prior to submission and re-merged as needed after I took any feedback.
- [x] I have squashed my changes into one with a clear description of the change.
# Reference/Link to the issue solved with this PR (if any)
# Description of the problem
Internal headers must not be referenced by any public header. The recent u2b changes caused iothub_client_core_ll.h to include internal/iothub_client_ll_uploadtoblob.h, which is incorrect.
Description of the solution
This fix removes this include directive from iothub_client_core_ll.h and moves the type IOTHUB_CLIENT_LL_UPLOADTOBLOB_HANDLE into iothub_client_core_common.h, solving the need for both client layer and upload-to-blob modules to reference this type.
Internal headers must not be referenced by any public header. The recent u2b changes caused iothub_client_core_ll.h to include internal/iothub_client_ll_uploadtoblob.h, which is incorrect.
Description of the solution
This fix removes this include directive from iothub_client_core_ll.h and moves the type IOTHUB_CLIENT_LL_UPLOADTOBLOB_HANDLE into iothub_client_core_common.h, solving the need for both client layer and upload-to-blob modules to reference this type.