Question(s) about custom attributes

[web_mgr]

I see were to add them, and I've created a new one called mpn (Manufacturer Part Number). Type=Text

How do I get that to appear by default on every product editing / entry page?

Also, I added it to one product by pressing "Add Attribute" on the product page. I then tried a sample bulk upload with one row of data and 2 column headers: SKU and mpn. It imported apparently without errors, BUT the new mpn data is not present in the product listing when I go back in to look at / edit the product. 

[Kavitha Mano · Accepted solution]

custom attribute is enabled and set the value “yes” to “visible on catalog pages on storefront” and “used in product listing” at the backend to display at frontend.

Reference : https://www.dckap.com/blog/display-custom-attribute-value-product-viewlist-page-magento-2/