Yesterday all images on one of my multisite websites became

Yesterday all images on one of my multisite websites became disappeared from the site. The images are physically still on the server, but were not being read.
My hosting provider was able to help me get the images visible on the site, but none are visible in the media library, all pages have gone, and all featured images.
The other websites appear to be fine.
Could someone please assist me?

Thank you and kind regards,

Richard