Dear shubhanginifashion,
Greetings from team eBay!
Inorder for us to help understand your issue, kindly let us know the details of the error faced by you while uploading the bulk file or uploading the catalogue files. Also if possible share the screenshots for better assistance.
Kindly reach out the eBay customer support team on the following link with the above mentioned details:
https://www.ebay.com/help/call_us?type=ContactUs&initFrom=HOME&topicId=4000
Regards,
eBay INCBT Team