As a reminder, if the application that you are trying to file happens to be a PCT application, consider filing it at RO/IB instead of RO/US. In other words don’t try to use EFS-Web for filing your PCT application. Use ePCT to e-file it directly at the IB. Of course if the invention was made in the US, you will need an FFL (foreign filing license). Maybe the FFL that you already received in your US priority application will cover the PCT application. Also keep track of when it will be midnight in Switzerland (ePCT will tell you what time it is in Switzerland).
A chief benefit of using ePCT to e-file your PCT application in the RO/IB is that you will instantly be able to see what you just filed. You can see the contents of your PCT application in ePCT (just like what you would usually do in Private PAIR).