Offerors are responsible for submitting proposals, and any revisions and modifications, so that they reach the government office designated in the solicitation by the time it specifies 1. Plan for upload problems, not for the deadline.
In Bids2Bank, a person must type the approval phrase before a package is marked submitted 2.
Win or lose, ask for a debriefing. Under Part 15 an offeror that makes a written request within 3 days after receiving notice of the contract award is debriefed 3.
If you believe the award broke the rules, the clock is short. GAO's rules require most protests to be filed not later than 10 days after the basis of protest is known or should have been known 4.
Indented paragraphs are invented worked examples. Tool links open Bids2Bank and need a free account.