Media Library appears empty

When entering the media library, I see the message “No media files found” and no files appear. I have seen a screen shot from another admin (possibly using an Apple) where the file descriptions appear. In the column for Image Optimizer, I see ·”Could not retrieve file path”

All plugins are up to date, and the issue remains when all plugins were de-activated. All the files appear to be in place in /wp-content/uploads/*.*

This site uses EWWW Image Optimizer, and I am not sure if this is supplied with the theme, or approved by you. So I apologise if this is not your issue.

Larger files no longer upload. I can upload small image sizes, but when using the multi-file uploader, the file uploads, then I get the message “Crunching”, which stays on the page.

Nothing has changed on the server re file size upload. This is a dedicated server, with other domains on it, and PHP Configuration Editor shows
upload_max_filesize : The maximum size of an uploaded file : 256M – but I see files (via FTP) of over 3G – when the upload limit has always been 256M

The site has recently gone over to “secure”, so now all pages are called with “https”. I wondered if this could be the reason for the message “Could not retrieve file path”, but can’t see where it is stored.