In order to add a custom field to an asset, you'll need to add the custom field to the product the asset is using. That way, it will appear for all assets using that specific product.

Let's add a custom field to the asset below, an iPhone 14 Pro Max with the Asset ID 100000. Start by clicking on the product of the asset.

Now, click on the Edit button.

Scroll down on the page until you see the Custom Fields section, and click on the Show button. This is where you can add your own custom fields that will appear for all assets using this product.

These are the types of custom fields you can create:

You can also choose if the custom field should be a required field or not. To add options to a Dropdown List custom field, you just need to fill out the Dropdown List Content field using this format: ["Option 1", "Option 2", "Option 3", ...]

In this example, we've added three custom fields; Color (Dropdown List), Storage Space (Number Field) and eSIM Version (Checkbox).

Once you've added the custom fields, scroll down and click on the Save button. Then, go back to the asset page and click on Edit Asset.

After scrolling down to the bottom of the page, we can see that the custom fields we added are now visible and can be filled out for the asset!

Once we've filled out the custom fields and saved, we can see that they now appear for the asset!

In order to remove a custom field from an asset, you just need to go back to the Custom Fields section of the Edit Product page and make the Field Title field empty for the custom field you'd like to delete, and click Save.