I am sorry for the late reply Richard.
Yes, the file was stored in a Sandisk card made by Panasonic Lumix camera. Sincerely, I don't remember if this kind of file format name, it was setting by me or directly by the camera and yes, until now, all the files, that I have on my mac, created by this camera, have this type of format name.
Yes. I could see the images in the preview and in the camera monitor.
I think at this point, some import data was missing during the process.
In the meantime, I am happy, because I have restored most of the lost files in the SD card, with the Sandisk Rescue Pro app, but I would like to know why this happened, to eliminate the problem.
Thank you very much, for your help.