5 Answers, 1 is accepted
Dragging attachments from Windows to web application is not supported by the most of the browsers and thus is not a functionality available in RadFileExplorer. Such a topic is discussed in the following thread, you can find the information in it useful:
Telerik by Progress
Since now asyncupload supports drag and drop from outlook, it moves the messaged and not copy it like radupload(depreciated).
I am using outlook 2010.
Can this be fixed so it will copy and not move the message?
Microsoft has a bug report where the drag of the messages to any non-Microsoft browser (meaning Internet Explorer or old Edge) is not supported:
You might see this "working" due to some commits that Microsoft made to the Chromium core, which will be used in the new Chromium-based Edge browser.
With that said, we might need to wait for Microsoft and Chromium teams to implement the correct message upload and then the AsyncUpload might be able to properly handle the message drag and drop directly from outlook.
In the meantime, the only solution is to drag the message/attachment on the file system and then upload the files.
You can also follow this Feedback portal item for any progress on and news on the topic: