'Problem adding new fields (images) to a Netlify CMS collection

I have a collection for the blog posts and now I want to edit it and 2 new fields: one for the featured image and the second one for a thumbnail image. I did it on localhost and works fine, but when I merge it to production I can not see the images in the posts that I have already in the blog.

If I create a new post from scratch is working fine and I can see both images, but how could I add those images to the existing posts? (In the existing posts I have added the images via the CMS using the 2 new fields that I created) ).

I have spent almost all day trying to solve it and I am desperate.

Does anyone know how to solve this issue?

Thank you in advance.



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