From AOS to pending to green card

Question details

If the employee was already working for the employer using AC21 (using EAD) and was already on payroll Then what steps employer has to do to actually get the employee on the GC job other than changing I-9 details. And what document proof employee need to have that may be helpful when one apply for citizenship ? to prove that employee indeed gave employee the GC job ?

ANSWER
Other than updating the I-9, there are no immigration law steps involved in going from AOS to pending to green card. There is no need for any specific documentation. So far, no proof of job has ever been required. Your W-2/Paystubs should suffice, if the issue ever arises. If you are unsure, just get a new offer letter confirming the job.
Other than updating the I-9, there are no immigration law steps involved in going from AOS to pending to green card. There is no need for any specific documentation. So far, no proof of job has ever been required. Your W-2/Paystubs should suffice, if the issue ever arises. If you are unsure, just get a new offer letter confirming the job. - See more at: http://www.immigration.com/comment/13369#comment-13369
Other than updating the I-9, there are no immigration law steps involved in going from AOS to pending to green card. There is no need for any specific documentation. So far, no proof of job has ever been required. Your W-2/Paystubs should suffice, if the issue ever arises. If you are unsure, just get a new offer letter confirming the job. - See more at: http://www.immigration.com/comment/13369#comment-13369
Other than updating the I-9, there are no immigration law steps involved in going from AOS to pending to green card. There is no need for any specific documentation. So far, no proof of job has ever been required. Your W-2/Paystubs should suffice, if the issue ever arises. If you are unsure, just get a new offer letter confirming the job. - See more at: http://www.immigration.com/comment/13369#comment-13369
Other than updating the I-9, there are no immigration law steps involved in going from AOS to pending to green card. There is no need for any specific documentation. So far, no proof of job has ever been required. Your W-2/Paystubs should suffice, if the issue ever arises. If you are unsure, just get a new offer letter confirming the job. - See more at: http://www.immigration.com/comment/13369#comment-13369
Other than updating the I-9, there are no immigration law steps involved in going from AOS to pending to green card. There is no need for any specific documentation. So far, no proof of job has ever been required. Your W-2/Paystubs should suffice, if the issue ever arises. If you are unsure, just get a new offer letter confirming the job. - See more at: http://www.immigration.com/comment/13369#comment-13369
Other than updating the I-9, there are no immigration law steps involved in going from AOS to pending to green card. There is no need for any specific documentation. So far, no proof of job has ever been required. Your W-2/Paystubs should suffice, if the issue ever arises. If you are unsure, just get a new offer letter confirming the job. - See more at: http://www.immigration.com/comment/13369#comment-13369