- PutObject() does not return an md5sum of the uploaded file as an etag response. Apps that check vailidity will fail.
- PutObject S3 API does not return the md5sum of an uploaded file as it's etag response. Applications that check the validity of the uploaded object by comparing these two values will fail.
- No support for CopyObject S3 API (There are no equivalent APIs available on Backblaze B2).
- No support for CopyObjectPart S3 API (There are no equivalent APIs available on Backblaze B2).
- Only read-only bucket policy supported at bucket level, all other variations will return API Notimplemented error.