How to scan documents on a Apple smartphone or tablet

Apple iPad Pro 12.9 (2020) Apple iPad Pro 12.9 (2020)
Apple iPad Pro 9.7 (2016) Apple iPad Pro 9.7 (2016)
Apple iPad mini 4 (2015) Apple iPad mini 4 (2015)
Apple iPad Pro 12.9 (2018) Apple iPad Pro 12.9 (2018)
Apple iPad Pro 11 (2020) Apple iPad Pro 11 (2020)
Apple iPhone 12 Pro Max Apple iPhone 12 Pro Max
Apple iPad Pro 12.9 (2015) Apple iPad Pro 12.9 (2015)
Apple iPad 9.7 (2018) Apple iPad 9.7 (2018)
Apple iPhone SE (2020) Apple iPhone SE (2020)
Apple iPhone 11 Apple iPhone 11
Apple iPhone 11 Pro Apple iPhone 11 Pro
Apple iPhone 11 Pro Max Apple iPhone 11 Pro Max
Apple iPad Pro 11 Apple iPad Pro 11
Apple iPad mini (2019) Apple iPad mini (2019)
Apple iPad Air (2019) Apple iPad Air (2019)
Apple iPhone XS Apple iPhone XS
Apple iPhone XS Max Apple iPhone XS Max
Apple iPhone XR Apple iPhone XR
Apple iPhone X Apple iPhone X
Apple iPhone 8 Plus Apple iPhone 8 Plus