Network Path Not Found When Trying To Access Computer On Home Network

Error code 0x80070035
 
I have two computers that I'm trying to get to communicate with each other so I can move files back and forth between them.  My plan is to make one of them the home's backup and main storage system.  the problem is that I can only seem to get one of them to actually communicate equally.  Computer 1 is a factory Lenovo Intel i3 computer.  Computer 2 is a home made AMD that I just built a few weeks ago.
 
Both are running Win 10 Pro.
Both are physically attached to the router. Heck, they're physically stacked on each other on my desk....
 
Using File Explorer, on the left side Panel under Network, it shows both computers: AMD and Lenovo.
 
Computer 1(factory) is able to the files on Computer 2 easily by going over through File Explorer.  But, if I click on one of the files, I get the message that I DO NOT HAVE PERMISSION. If I try to cut/Paste files from Computer 1 to computer 2, I get the same message.
 
Computer 2.  I am also able to see the computer listed under Network in the left panel.  When I click on Computer 1 to access it, I get a Network Error Windows cannot access Lenovo   (Computer1) Error code 0x80070035
 
I've tried the Diagnose option and it doesn't work.
 
If I click on a Drive under Network on the very computer, I can see the drives, I can see the directory list.  If I click on a file, I get the error.  Example on the left side panel on my AMD computer I select:
 
>AMD
>C:
>PerfLogs
 
It's at this point that I get the error: Windows cannot access  amdcPerfLogs as an example
 
I've tried running through Homegroup setup and Googled for days on setting up a network with Windows 10 and can't seem to figure out what I'm not doing here to make these computers talk and communicate with each other.  I eventually, want to get all my computers to talk to the AMD so I can use it for a main storage/backup for the home network.