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First off you will need to check the NTFS permissions on the folder you are trying to share. Then make sure you have the folder set to be shared.
Is the computer setup to be shared with a password or do you have it set where anyone can access the shares?
Ok, first lets make sure the discovery is working properly. There are 2 services that should be running but for some reason in 1803 they never run and cause networking issues.
You need to set two services to automatic (delayed start):
Function Discovery Provider Host
Function Discovery Resource Publication
Open a Run box, (win key + R) type services.msc and press enter to open the Services List. Scroll down until you find those two. Set them to automatic (delayed start). Then right click and start them both. That PC will now show up.
You will need to do this on both machines if they are both on 1803.
Ok, let's dig a little deeper.
Click on Start and then type share
You will see advanced sharing options show up. Press enter.
At the bottom click the arrow on All Networks to show the options there.
Make sure at the bottom Turn off password protected sharing is selected.