Missing file after random update

Check these first:

• Trash folder

• Recent files (Finder)

• Spotlight search (file name or type)

• iCloud Drive (especially Desktop/Documents)

• Time Machine backup, if enabled

If the app crashed during update, the file may not have been saved.

No idea what kind if file, where it was, or whether you had it backed up or saved at all.

Please read this then come back and provide some information we can actually work with.

https://discussions.apple.com/docs/DOC-5931