Wordpress / WooCommerce - Product Image has no Link to Add

I'm new to Wordpress. I installed the Livre Theme and WooCommerce.

In the Edit Product screen, there is an option to add a Back Cover Image. But, unlike the other fields which have a link at the bottom to say 'Add Product Image' or 'Add Product Gallery Images' the Back Cover Image section has no link.

Can anyone advise me on how to fix this. I have tried contacting the Theme Creator but got no response.

Here's a screenshot showing the problem:

Here's what I've tried:

I've uploaded the dummy content for this theme and what's really bizarre is, when you view this product (see screenshot) the back cover is there. I have no idea where it's getting it from or why it's not there on the product page when the front cover and look inside are.

I've looked everywhere through all the settings and can't figure out why the link is missing.

Thanks!

Thanks to @VijayHardaha for his comment which enabled me to get to the bottom of this.

I disabled all the plugins then re-enabled them one-by-one (it should have occurred to me to try this but I'm new to website development).

I found the conflict with Elementor. As soon as you disable that plugin, the Back Cover Link appears.

Not an actual solution (I have no idea how to resolve the conflict) but it's a useful workaround.

Disable Elementor, Add your Back Cover Image and if you want to continue using Elementor, re-enable it. The Back Cover Image remains, it's only the link to change it that disappears.