Preview under Big Sur and “Modify” function

1) MacBook Pro 17 “early 2009
2.66 GHz intel Core 2 Duo processor
8 GB RAM memory,
500 GB SSD internal boot drive under El Capitan

2) MacBook Air early 2019 (Retina, 13-inch, 2018)
1.6 GHz Intel Core i5 processor
mémoire 8 Go 2133 MHz LPDDR3
256 GB SSD internal boot drive under Mojave or Catalina

2) iPhone SE sous iOS 13.3.1 32 Go

3) iPad Air running iOS 12.2

–