Lost wav file

[Nina23776706pu18]

I saved a file as waveform however when I went to open it again, it says that the file could not be found. I have attached two screenshots below. 

Is there any way I can retrieve this file?

[emmrecs]

I'm not a Mac owner/user but I see your screenshot points to your iCloud folder.  Have you checked whether the missing file is saved on your computer, rather than to the iCloud?

Incidentally, assuming you save to the iCloud as your default, it is always advised in these forums that such a practice is far from ideal!  You should save the file locally and then, if required, back it up to your cloud storage.