Thank you that proved very worthwhile.
Just in case someone is wondering here is the solution:
@echo off
set DRIVE=none
if exist " C:\Users"%USERNAME%"\OneDrive\Eagles\Distribution " set DRIVE=C
if exist "D:\OneDrive\Eagles_GrandReceiver" set DRIVE=D
if %drive% == none echo "Drive not found . . ."
If %drive% == none pause
If %drive% == none exit
Echo Drive found as %DRIVE%
mkdir C:\FECopy_GrandReceiver
DEL C:\FECopy_GrandReceiver\Eagles_GrandReceiver_Copy.accdb"
COPY %DRIVE%:\OneDrive\Eagles_GrandReceiver\Distribution\MasterFile\Eagles_GrandReceiver_Master.accdb "C:\FECopy_GrandReceiver\Eagles_GrandReceiver_Copy.accdb"
Start /wait C:\FECopy_GrandReceiver\Eagles_GrandReceiver_Copy.accdb"
DEL C:\FECopy_GrandReceiver\Eagles_GrandReceiver_Copy.accdb"
EXIT /b