In older versions of SSL Visibility, the WebUI allowed the import of PKCS#12 (PFX) files into the all-known-certificates-with-keys list by only uploading the file into the Certificate container. This worked since the Certificate and Private Key are in the same file and SSL Visibility was able to extract each one separately. Now if this is attempted and error will be presented saying "No file chosen".
This error is presented since SSL Visibility now expects the same PKCS#12 (PFX) file to be uploaded into the Key container.
By uploading the same PKCS#12 (PFX) file to the Certificate and Key containers the error is no longer shown and the Certificate and Key will be uploaded successfully.