Hey there, you're quite welcome. No, you don't need to show those documents at the time of application. The verification cross checks all of that.
As for the importance, it depends on what is found. Generally, if they invite you to interview they will ask why you have two 1-year work experiences and they'll probe you to find out what happened - you'll have to divulge you were fired from one and that you quit from the other. They won't let something like that go undiscovered during the admissions process. Generally speaking, unless they find untruths in your application, the verification process goes smoothly. However, if you lied about where you worked or grossly misrepresented your salary, etc. - that'll be grounds for a revocation of your acceptance.
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