When you import Products – the “Tags” column value was taken just from the first row.
Now the app will import all the tags that are in all the product rows.
That way you can have even one tag per row if you like.
For example, if you need to put the Option Values as product tags, you can just copy-paste those option column values into Tags column, and use the “MERGE” as the “Tags Command” – that will add those tags to your product existing tags.
Read our tutorial on how to bulk manage your Shopify tags.