Nobody else has mentioned this issue before
You may need to check with WP. But from looking at the file name itself, ~~~~_wfcache.html_gzip doesn't have a file extension, and the ~~~~ might also be an issue. You would have to check with filezilla and your OS's site for allowed file name characters.
You may need to check with WP. But from looking at the file name itself, ~~~~_wfcache.html_gzip doesn't have a file extension, and the ~~~~ might also be an issue. You would have to check with filezilla and your OS's site for allowed file name characters.