Image not showing in Bulky “image” row – Is WEBP files supported ?

I was testing the Free version of Bulky and then bought it because I was thinking that the “Image” row not displaying was a feature of the PRO version.

After installing the PRO version, I got the same problem.

Images are not displaying in the “Image” row.

All my uploads to my website go in WEBP file format to be more efficient.

Could that be the source of the problem ? Can you confirm if WEBP files are supported ?

PRECISIONS : I got WordPress 5.8.1. When I add WEBP files to my media gallery, WordPress create a bunch of different sizes of the image, ALL those in WEBP format.

Thanks a lot !

Nicolas