Cannot Locate Airdropped files
I recently updated to the latest versions of my devices: Catalina (10.15.5) on my Mac and iOS 13.5.1 on my iPad Pro. Since updating, when I send a pdf file (as well as other types) from my Mac to my iPad, I get a beep on the iPad acknowledging that the file has been received, but the window asking which app I want to open the file no longer appears. As a result, I cannot locate the transferred file on my iPad. It doesn't appear in any of my apps on the iPad, and I cannot find it by searching my iPad. How do I fix this?
iPad, iOS 9