Hi, @maranolo !
You can change the email image and text as well. To do this, head over to Settings > Notifications and find the notification labelled “Gift card created”.
To change the image in the email, find the following code:
<img src="{{ 'gift-card/card.jpg' | shopify_asset_url }}" alt="">
And simply replace it with the new code, replacing YOURFILENAME with the name of the file you uploaded into your theme asset:
<img src="{{ 'YOURFILENAME' | asset_img_url: '1024x1024' }}" alt="">
Once you’ve done that, you’ll also be able to change the email contents as well. If you need a further hand, please let me know.