How can I bulk update product weight information in my inventory?

[Sashop]

When entering product information, I have missed adding their weight to very many products. When a purchase is made, the customer is not charged postage due to the missing weight. This has forced me to pay postage. I have exported the inventory to excel and changed the weight but upon importing it back to shopify, the weight is still missing. Is there an easier way to do this other than going into every product page to correct my issue? Thank you

[AnneLuo]

First export the product CSV file, then fill in the Variant Grams column in the product table, and finally import the modified file. Please check whether the modified field is incorrect. Or can you upload the modified csv file here？