Does Saral send remittance advice to suppliers?

Open this screen in Saral/accounts/settings?tab=Payments

Yes. When a run is marked paid, a remittance advice is drafted for each supplier and sent when a person presses Send all — the default Review mode. On Accounts → Settings → Payments the mode can be Automatic (sent at once) or Off.

Not what you needed? Inside Saral, ask Kuku (Alt+K) — if it cannot answer, “Ask a human” sends the question to Saral support with the chat attached.