Until they renew their certificates, Vola is currently not a good place to upload your content. They allowed their security certification to expire and even worse have up a code on their site that makes it impossible to ignore / overlook the expired certificates to download anyway.
As far as I am aware currently it is only one of their security certifications that failed. "dl1.volafire.org" But it is impossible to control which security cert vola uses when you upload files so all files that get assigned that dl1 instantly becomes an unusable file.
Until this gets resolved you will want to look to other hosting services.
Here is what happens when anyone attempts to download a file that had the bad luck to use that certification…
>Your connection is not secure
>The owner of dl1.volafile.org has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.
>This site uses http Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate.
>dl1.volafile.org uses an invalid security certificate. The certificate expired on Sunday, June 17, 2018, 6:43 AM. The current time is Sunday, June 17, 2018, 10:58 AM. Error code: SEC_ERROR_EXPIRED_CERTIFICATE