Do not make changes in Amazon Ads Console because they can be overwritten the next day. If you want to change a bid or budget, do it directly from the Advigator dashboard, and it will be synchronized within 5-10 minutes.
Your changes to budget, target ACoS, and keywords are updated in Amazon Ads within 5-10 minutes. Search term report analysis activities such as adding new keywords or calculating new bids per click is done every 24 hours. Campaign performances are imported every 24 hours.
You can see all bids and keywords changes by going to Amazon Ads console > History.