While i am trying to upload any file in the SharePoint library (in SharePoint Online). It gives me an error "Ensurer was not managed across thread transitions". Not able to figured it out why it's happening. Please help somebody to fix this issue. I am facing this issue since last 3 hours. Before that everything is working fine.
Follow the below steps:
- Open the SharePoint URL link in IE (internet explorer)
- Go to bottom left and click on the link "Return to classic SharePoint" (as shown below)
Now you will able to upload file (issue is related to SharePoint modern UI).
The same approach can be used if facing issue while uploading on "OneDrive".