@arzzey, was the option to "automatically delete files from camera after importing" selected when you imported your contents to Quik for Desktop?
Is there any chance the files are in your Recycle Bin or Trash on your computer? Did you delete the downloaded copy of the file? Any chance the original may still be on the SD card?
Unfortunately, we do not have any preferred methods of data recovery as this may vary from SD card manufacturers of the preferred methods for recovering your data. However, you may be able to perform a Google search to find various data recovery options to recover the footage that had been lost. Yet, please do your research on whichever data recovery software is best for you as it may require activation of the software and there may be varying costs.
Since this is certainly not normal for missing files to suddenly go missing, we recommend to reach out to the SD card manufacturer to further troubleshoot the SD card.
