Updating products from publications for Prestashop
To create a Prestashop product update configuration, proceed from Catalogs > Publications and click on +New Configuration.
Upload the file containing the products and their information, taking care to select the correct separator and text delimiter (if present). Then click on Analyze.
Select Prestashop sales channel and Update publications .
Proceed with mapping the identifier and columns you want to update.
Give your configuration a name and Save .
Then from the Catalogs>Publications section, under the buttons under Actions, click on the first Play.
Upload the file again, click Preview and then Run to launch the configuration.