Hi Aspirant!
If you already get seat in Round 1 and then you want to go for Round 2 then "Yes" you have to submit your documents and fees at the reporting centre to participate in another round.Otherwise if you not get any seat in round 1 then you do not have to report before.

I hope it helps.

For more information you can follow up this Career360's article:

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

Happy Hustling!