Hi there,
Are you referring to uploading products? This is possible using the Wix CSV Template File.
To download the Wix CSV template file:
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Go to the Store Products tab in your site’s dashboard.
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Click the Import icon at the top of the page.
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Click Download CSV File.

- Choose an option:
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Blank Wix CSV template: Import products from another store.
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Wix CSV with your products: Update existing products. Learn More
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Open the CSV file.
Note: Mac users should open the file with Numbers or Excel version 15 or higher. -
Save the downloaded file in CSV (Comma delimited) format.
You can read more here: Wix Stores: Importing Products to Wix Stores