Getting error: Error : invalid title (special characters not allowed)
Etsy doesn't allow special characters in the title, please update the titles from Shopify or from the App. If you want to edit the product's title from the App then need to follow these steps:
1.) Click on the product's edit button, change the title and save it. 
2.) Check the "Manage Listings on Etsy via the App" setting for the title before updating titles from the App.
3.) Then, publish the listings from the App's "All Product" section.
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