In order to protect your private files, all date added to GalleryVualt are saved and encrypted in your own device. If you haven't deleted GalleryVault date or change phone, you can use feature 'Find Lost Files' to find them back in GalleryVault Setting.
If it doesn’t help you, please follow the questions to find the answer:
What happened before you noticed that your content is missing?(Click to view the solution)
1) Format phone;
2) Update APP;
5) Delete the files.
Warm tip: In order to prevent your encrypted files from being cleaned by Anti-Virus software or cleaning software, it is best to link GoogleDrive to ensure that files are no longer lost.
Thanks for your understanding.