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edit: any admins know how i can give the bounty to glls? He inspired me to give field access to the picklist at the profile level. Which solved the issue

added createOppLineItem() apex class

    @AuraEnabled
    public static void createOppLineItem(OpportunityLineItem newOppLine){
        insert newOppLine;
    }

but here's the edit form package prior to submit where the Promo__c is showing.

 fields prior to submit and AFTER to custom additions : {"To_Theme_Denom__c":"0.01","Promo__c":"EM - Content Promotion – LAC","Min_or_Flat_Fee_Amount__c":"54","Quantity__c":1,"Discount__c":null,"Standard_Build_or_Laminate__c":"Standard Build","Incremental__c":false,"Use_Existing_Customer_Profile__c":true,"Topper__c":true,"Notes__c":"test","Cabinet__c":"a9X5Y000000Y1xUUAS","Brand__c":"a9W5Y000000Pwf2UAC","To_Theme__c":"01t5Y00000DY1pRQAT","Sales_Toolkit__c":"a4W5Y000002e5m4UAA","To_Actual_Theme__c":"a095Y00001BqV7cQAF"}