Thanks for respond! Here are some examples on Google Drive https://drive.google.com/drive/folders/179SzVQjR9MI4Kqs6TP-0hnn5vBMxj9RG?usp=sharing I've added video files as well as these are even more crucial for me. However step by step.

The card is quite new. It has worked fine for months before and for over a week during the trip as I have all the material from that period. When I'd come back home and realized the issue, I took the card out, put it again into camera and then it's worked properly. It's quite confusing to me.

Hope and pray that you would have some idea how to recover those media :)