This file is CR3 and not CR2 as extension suggests. I had to change extension to CR2 as CR3 extension is not listed in files allowed to be uploaded.
I tested by moving file to different folder and ART started without any issue. As soon as I started it after moving file back, it crashed again. Sometimes it doesn’t crash instantly but only on trying to open DNG file to edit.
Let me know if more details needed.
I tried converting with both digikam 6.x and 7.x