Watch this video on how to upload all your stock from OMNI to FSC.
The "Load Omni Stock" button on the Stock Items list screen is only available to super users and not to Administrators.
When selecting this button it will active the service calls to OMNI which will not be visible to the user on the UI. Please do not click this button more than once. Ensure that the service is done before selecting the button again or on a different instance.