Dragging from Outlook to AWS S3 bucket delays

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Hi guys,

I have come across a very unusual issue. Dragging emails directly from outlook to an AWS network drive results in 20-30 seconds of delay before the file begins to transfer.

Here is the packet capture when dragging directly from Outlook to the shared folder: https://anonfile.com/T1haAdjfb6/Outlooktransferpcapng

Here is the packet capture when copying the same file but from the Desktop to the shared folder: https://anonfile.com/L2jaA7j7b1/Desktoptransferpcapng

Any help would be much appreciated