It’s important that the file you upload for bending is a flat, 2D vector file. We have tutorials here you can follow to learn how to turn a bent part into a flat pattern in various CAD software.
Once you’ve uploaded your file, you can preview a 3D model of your part during the checkout process. At that point you can check to make sure the angles and flange orientations are correct, and make any adjustments to those within our checkout process without having to upload a new file.