Domain whitelisting

If you're having troubles uploading screening data from your local PC it's usually due to a firewall issue.

Please begin by referring to Lexplore Domain Whitelisting and ensure all necessary URLs are whitelisted to prevent firewall issues.

To isolate the issue further, you can try using a Guest WiFi or a Mobile Hotspot.  If either of those work, then you know the issue is firewall related with your main WiFi connection.