Pagination method not calling on scroll up.

[devendralohar]

this getMessageHistoryByPage(destinataryId: any, size: number, page: number): method is not calling when I scroll move down to up to load more history data. here is my configuration <ng-chat #ngChatInstance [adapter]="adapter" (onMessagesSeen)="messageSeen($event)" [historyEnabled]="true" [historyPageSize]="10" [hideFriendsList]="true" [emojisEnabled]="true" [userId]="userId">