Data Loss Prevention (DLP)
When using the Vivaldi browser, Endpoint Prevent is not detecting https uploads.
It does detect http uploads.
Https uploads are detected on the Chrome, Firefox, Edge, and I.E. browsers.
While Vivaldi is based upon chromium, they do add their own code.
We have not tested Vivaldi and it is likely that the code they add to the browser is preventing us from detecting https uploads.
Until we certify Vivaldi, we suggest you do not use it.