Custom connector refresh to update existing data

[Anonymous]

HI Everyone,

Is there a way to update existing data instead of pulling all the data from scratch via the custom connector?
Mean pulling only the updated data from the last pull by aggregation and implementing the refresh function in the custom connector VS the connect function that pulls and loads all the data to the Power BI app via the custom connector?

[Anonymous]

Someone? 
No one has done that before? Thanks!