If you get admitted to the institute then there will be date given where you have take all the necessary documents required or as instructed to your college campus and then they will manually verify all the documents and you admission will be finalized. So online reporting is important but after that also you have to participate in an offline verification procedure.

To know more about josaa counselling visit the link provided below:

https://engineering.careers360.com/articles/josaa-counselling

I hope this answer helps. All the very best for your future endeavors!