Hi shimizu_111
Thank you for reaching out to Microsoft Advertising Community Forum! My name is John, and I will be assisting you with this query.
I understand that you encountered an error message after uploading the feed file using the method "download file from URL".
Here are some of the things that we need to check
>You may use Automatically download file from the URL option if the feed file is smaller than 1GB and on a publicly accessible server.
>Your feed file must be tab-delimited plain text with extensions: TXT, ZIP, GZ, GZIP, TAR.GZ, TGZ. We only support XML files if it is an existing Google-formatted XML file.
>Take note of the required fields of a feed file How is the feed file organized?
Based on our Platform Health Blog Microsoft Advertising Platform Health Blog, we don't see any identified issue(s) on uploading a feed file on the Merchant Center store.
I hope the information provided here will at least provide ideas. If the issue persists, please do not hesitate to reach out to our support. I have also sent you a private message so I can begin the investigation on this case.
Kind regards,
John | Microsoft Advertising Support Specialist | 800-518-5689