Hi everyone, I fixed it. So the issue was that my outgoing server was automatically set up by the Windows app when I logged in. So the solution is to manage the account, change sync settings, then click on the advanced settings and change the outgoing server to Vivaldi's SMTP server as shown in this link: https://forum.vivaldi.net/topic/176/vivaldi-net-email

SMTP
server: smtp.vivaldi.net
StartTLS Port: 587
Auth: Your Vivaldi user name and password

The incoming server isn't necessary to change since it work regardless. The formatting for the outbox: smtp.vivaldi.net:587

Hope this helps others when others couldn't help me.

Yes, the dreaded 'Hamburger' does not respond but all other tools do.

2020-06-14 11.01.12 greybeard.vivaldi.net.png

@Gwen-Dragon
Gwen-Dragon wrote:

Vivaldi has no access to the Google API because of Google's license restrictions.

If Vivaldi has no access to the Google API, then the connected app mentioned above would not be able to create files.

HOWEVER, it can create files.

So it follows that what you wrote does not explain the problem.

The problem is that when trying to reopen the file with the connected app that created it, Vivaldi gives a blank, empty, window.

If Vivaldi has no access to the Google API, then there would not be a workaround for the problem using the app.

HOWEVER, there is a workaround using the app.

So it follows that what you wrote does not explain the problem.

For a thorough discussion of the problem as it relates to the connected app mentioned above as well as other such apps, details about the workaround, and instructions on what to do to experience the problem for yourself, see my posts starting here:
https://forum.vivaldi.net/topic/22164/connected-apps-in-google-drive-don-t-work/5