SanDisk SecureAcces 3.0 problem. Drag/drop to browser page bug


I need some help here. I had SanDisk USB drive and I moved some files in the Vault and it works perfectly fine.
But today I accidentally dragged all files from Secure Acces window to a browser page (Just try to drag the file to see if it can upload onto pCloud page or not - it was Chrome browser) and all files just disappeared from from Secure Acces! Could not be found!

Could any give any reccomendations how can I restore the files. Thank you in advance