Hey @VishnuPriya98
Here are the mandatory columns required in the model CSV:
ID (Product ID), Name/URL, Category, Status & Last Updated.
Upload might have failed because when you removed some columns, you likely omitted one or more of the mandatory columns that adobe target required to serve recommendations.
The above mentioned mandatory columns are the foundation of how Adobe Target recognizes and recommends products.
These columns are necessary because Adobe Target uses them to classify products, identify them, and provide users with relevant suggestions depending on inventory.
Hope this helps