After creating the Voucher click documents on the top to attach any bill, document of the voucher.

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You can attach documents of any kind: text / pdf / doc. For example scan of a bill with a payment Voucher. Choose the file to be uploaded and enter the description. For example electricity bill,travel expense bill. The documents attached can be viewed from Doc grid. To know more Click here. The doc type can be renamed from M1 settings according to your   preference. For details see Help File on M1 settings.