How to make Windows 10 share updates over LAN

Question

I have 4 computers at work, and even though "Updates from more than one place" is ticked at "PCs on my local network" I notice that it doesn't (we don't have a broadband Internet, unfortunately just a LTE with limited transfer).

All those computers are connected to the same router, all have enabled every sharing setting, even documents etc. (when I go to "Computer" > "Network" I see all other PCs and folders like Documents, Music etc.)

Is there any fix or way to have Windows 10 use updates already downloaded on other PCs on the local network? If downloaded four times is quite excessive and inefficient IMHO.

Thanks in advance for any replies/ insights/ suggestions/ solutions :) Should anyone need further details, please let me know.

Solution

Microsoft states at his FAQ that not entire update is downloaded from other PCs on local network: Windows Update Delivery Optimization: FAQ.