I don't think we can write to c:\ but can you use the below commands to check the files in test directory(is there any setting causing to hide these files?).
Open cmd terminal
c:\Users>cd .. c:\>cd c:\test c:\>dir
then you are going to see all the files in the directory.
if you don't see any files still then use
PutFile[id=1967bc4d-0163-1000-1af5-b40c46be92b6] Produced copy of StandardFlowFileRecord[uuid=58d18018-a864-4c12-a98d-498bbf8d19d1,claim=StandardContentClaim [resourceClaim=StandardResourceClaim[id=1525145201278-982, container=default, section=982], offset=336986, length=168493],offset=0,name=3706261132832753,size=168493] at location c:/test/3706261132832753
Assuming with above logs to configure GetFile processor and configure the processor with your test directory and file filter as same filename that you have stored into the directory