关于亚马逊货箱大小`POST_FLAT_FILE_FROM_EXCEL_FBA_CREATE_CARTON_INFO`

I have some questions about SP-API uploading carton information:

1. Does the box size have to be uploaded? If you don\'t upload the box size POST_FLAT_FILE_FROM_EXCEL_FBA_CREATE_CARTON_INFO, but only upload the contents of the box POST_FBA_INBOUND_CARTON_CONTENTS, will Amazon charge extra because it doesn\'t have the box size?

2. POST_FLAT_FILE_FROM_EXCEL_FBA_CREATE_CARTON_INFO is uploading still workflow for submitting a feed?

3. I use Feeds API v2020-09-04, When calling the createFeedDocument interface, the corresponding contentType value is application/vnd.openxmlformats-officedocument.spreadsheetml.sheet; charset=UTF-8. When calling the createFeed interface, the corresponding feedType value is POST_FLAT_FILE_FROM_EXCEL_FBA_CREATE_CARTON_INFO. However, the information returned by calling the getFeedDocument interface is The file format is invalid. The Excel pack list should be uploaded as a .xlsx file. I tried. Windows creates a new xlsx, generates xlsx with PHP, contentType is replaced by application/vnd.ms-excel; charset=UTF-8, blank excel, etc., but the information returned by getFeedDocument remains unchanged...

4. The TransportDetails values is NonPartneredSmallParcelData

I use the PHP SDK Feeds 2020-09-04.

Have you ever encountered this problem of not recognizing file types? I\'m almost depressed!