Giuseppe Scollo highlighted that it is not possible to upload an existing supplemental feed in the Google Merchant Center Next interface prepared in Google Sheets.
There are three options available, but using a pre-prepared spreadsheet is not one of them:
- Using a TXT or CSV file
- Using a Google Sheet template (starting with an empty template)
- Adding product data using API
But, fortunately, Emmanuel Flossie has recorded a video with explaining a workaround. You can watch it here:
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