CSV import not working + Design tab shows 404 (Elementor Loop)

Hello VillaTheme Support,

I am using WooCommerce Product Size Chart Premium and I am running into two issues that I cannot resolve.

1. CSV import does not work
The plugin UI allows CSV upload, but importing a CSV file does not create or update any size charts.
I use simple CSV structure according to your template

Result:
No data is imported and no error message is shown.

Is this is a known issue?

2. Design tab shows 404 instead of product preview

In the Design / Preview section of the size chart, I always see the 404 page instead of the selected product.

My setup:
* Elementor pro
* Using single product item

The size chart button and popup work perfectly on the frontend, but previewing the design inside the plugin is not possible.

Could you please confirm:

Is Elementor Loop/Grid officially supported for preview?
Is there a workaround to force a valid product context for preview?

Looking forward to your guidance.

Best regards,