I have had 2 files deleted that I NEED recovered !

I am using a premium platform through my business of Sound originals a wedding company I am uploading my footage for as a videographer.

There have been 2 large files that have somehow completely vanished once I dragged them onto the box folder here that failed to upload and have disappeared, this is extremely distressing and my position as a videographer is on the line if I do not get hold of these files.

Files - Cocktail Hour Interviews.mp3 / Cocktail Hour Interviews 2.mp3

I need these files recovered im really losing it over what has happened, this was a submission under a premium account so there should be a 14 day grace period for recovery. The main file I need Cocktail hour Interviews.mp3 was 90%+ uploaded before something failed so the record of the video or 90% of it should be in the system!

Screenshot of error attached.

It is under the folder