Impact of Gst on Outward supplies through e -commerce operator in GSTR-1

As we supplied the goods through e-commerce operator (like as Amazon, Flipkart), but at the same time there is a liability for e-commerce operator to collect TCS @1% on the amount which have to pay to the supplier.

And the e-commerce operator have to require to furnish GSTR-8 and the same statement will be auto populated in part D of GSTR-2A .And for matching the details the supplier require to furnish the details in GSTR-1 in B2Cs table if the supplies to unregistered dealers to claim the TCS credit.

So I want to ask whether there is TCS provision applicable or not on e-commerce operator and when it to be applicable and also when the GSTR-8 to be furnish for July month.