The federal government and states have tried to streamline electronic filing to eliminate any paper, but sometimes supplemental information is not able to be filed electronically, or cannot be, due to legal requirements.
The alternative would be to send your entire return by mail, in which case, your processing time is much longer.
Depending on what documents are asked for, you many avoid having to send those in the future by eliminating whatever activities created the need to send those documents.
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