MethRaptor I just checked, and it's exactly what I said it is. Discord uses the system file picker, which has access to all files. Discord doesn't have access to any files you haven't given it access to with storage scopes.
You can test that by giving Discord access to one image, then try to upload an image. You will see the one image in the upload box within Discord because that's all it has access to, but once you tap browse, you can browse everything using the system file picker.