Looks like you have default settings on your server.
OneView - Administration - Options - SNMP
check box "User MyMibs Directory on the Server
I also believe this requires a server restart to load the MIBs.
Note: if server.log contains SNMP MIB ...
FlexViews use MIB OID Names as well as type definitions in the MIB to render and set values.
The FlexView editor works with MIBs on the client and creates FlexViews on the client.
if you want to run these from the server in OneView not just the Flex...