Hi @Trungyy, thanks for posting on the Community!
Let’s see if we can locate these files on your account. Could you check the deleted files page first of all to see if they are there so you can recover them?
If not, check the events page for any recently deletions, or shared folders being removed from your account.
Lastly, if there's nothing there either, were these files stored on your account directly, or via a shared link to a folder?
Keep me posted!