I created a custom field with many values, but whenever I upload through spreadsheet, none of the values show up in the product’s detail page except for the first.

Upon creating a custom field, the values of the field should be comma-separated. However, we naturally tend to add a whitespace after our comma. This adds a whitespaces in front of each value possible. Therefore, simply make your list of values without the whitespace. Here is an example: Custom field: Colour Values: red, blue, green Result: red is the only value displayed Custom field: Colour Values: red,blue,green Result: red, blue and green display