We are overriding our standard 'Add Product' button on Opportunity in Classic to redirect to a Visualforce page. Works fine there. When migrating to LEX, we are seeing that this action is unavailable. The button isn't present in the UI. The visualforce page has lightningStylesheets="true" and is "Available for Lightning Experience, Lightning Communities, and the mobile app". Is there anything else I need to be aware of to get this override button to show up on the layout?
Edit: Is is possible that list view buttons cannot be overridden in LEX as they can be in Classic? According to this : https://developer.salesforce.com/docs/atlas.en-us.208.0.lightning.meta/lightning/components_using_lex_s1_action_overrides_basics.htm overriding standard actions in List is said to be N/A, i.e. it is said to be possible, but you can't access the override in this situation. As I understand it ,it's a bit of a catch-22. Has anyone here successfully overridden a List button on LEX?