Missing audio

[etsku]

Hi
I have a project in where prerecorded drum tracks was delivered in Usbstick.
I placed drive in my computer and start a new session. Unfortunately in hurry I forgot to move the drum tracks in my computer.

I recorded other instruments and vocs in the session with those drum tracks.
Then I took of the USBstick and noticed that that session was missing all the tracks which are in the USBstick. Then I moved all the drum tracks from USBstick to my computer, but the session does not find them.

Help me and tell what is the way to find those drum tracks which are moved from Usbstick to my computer. Now the session finds only those which are in the usbstick.
Yours Etsku

[The Weed]

Import the files into Pro Tools. Just putting them in the Audio Folder isn't enough.