maximumSizeInBytes not enforced for multipart uploads

[tillschweneker]

Description:
When using multipart uploads, the maximumSizeInBytes setting is not respected. Files are uploaded successfully regardless of their size, even when they exceed the configured limit.

Steps to Reproduce:

1. Configure an upload with maximumSizeInBytes set (e.g. 10_000_000).
2. Upload a file larger than the configured maximum using multipart upload.
3. The upload completes successfully instead of being blocked.

Expected Behavior:
The upload should be rejected once the file size exceeds the maximumSizeInBytes limit.

Actual Behavior:
The upload completes successfully regardless of the file size when multipart uploads are used.