I have a problem with import files

Just for clarifying the situation.
The import function used for importing recordings from your USB storage device to your PC.
The export function can be used for creating and exporting from mono files to multitrack songs then exporting to your USB storage device.
You can see that “repaired” label because the wav file header (which created with your DAW) not matching with the wav file header what the uTrack24 created during recording.