Is there a way to stop uploading an attachment in outlook web add-in?

Question

I'm trying to get an attachment from an outlook mailbox, but I don't want it to be uploaded to microsoft server for security purposes.

I added the extension point in my xml file:

<ExtensionPoint xsi:type="LaunchEvent">
<LaunchEvents>
<LaunchEvent Type="OnMessageAttachmentsChanged" FunctionName="test" />
</LaunchEvents>
<SourceLocation resid="residUILessFunctionFileUrl" />
</ExtensionPoint> But my test function is only called once the file as been uploaded to the server. I was wondering if I could do and event.preventDefault() before the file is uploaded, but the event returned by the launchevent isn't a normal html event.

Here's my test function:

function test(event){
event.preventDefault() //This isn't possible
console.log(event)
}

Answer 1

Currently the feature you requested, is not a part of the product. We track Outlook add-in feature requests on our Tech Community Page . Please submit your request there and choose the appropriate label(s). Feature requests on Tech Community are considered, when we go through our planning process.