Message send indication

Currently, when I use Instagram to answer 24 hours later (some times even less than 24 hours), the charla messages never go to customer. This leads to problems, as I think the customer is updated with my answer, but the

Messages sync across platforms

When I reply to customers through messenger / Instagram / and or other platforms I would like the Charla chat for the given customer synchronized automatically in order to have full history of chat on both platforms. Currently Charla display