Hi xeechemist,
this would have to be an issue with either your site or host. That message basically means “We could not verify that this file is real”, which could be caused by one of two things.
a) the file is not a CSV. Perhaps an xls file or a png file or whatever.
b) the file could no longer be accessed
Since we are pretty sure that the issue is not a), it HAS to be b).
So what could be the cause?
Perhaps you are running some security plugin on your site that is blocking uploads. If so, try temporarily disabling the plugin to see if that now allows the CSV to upload.
If that is not the case, then the issue could be your host. This is something I cannot help you fix – only provide possible causes.
The issue could be with something called the tmp folder, which is a folder on your host where files get uploaded to in order to be parsed and validated in a secure location before being moved to the “real” upload location. For cheaper shared hosts, this folder can fill up really quickly and cause problems.
Another issue could be the permissions. If your folder permissions are not correct, then the issue could be that your site (and thus HD QUiz) is unable to move and access the upload from the aforementioned tmp folder. Try logging into your host and take a look at ./wp-content/uploads/hd-quiz/ and see if there are any files in there.
And lastly, this could just be a host configuration issue. One thing to try is to rename your csv file to something random but simple. Something like asdajhsdasd.csv — anything with no spaces or special characters or anything, and anything that is unique – a filename you have not used before.
Good luck and please keep me in the loop with anything you find or need further assistance.
