jool Is it possible to generate thumbnail from MXF OP1a files?
This is a video format? It could work, as long as your server supports FFmpeg.
It would also depends on the file's mime-type as "video/*", so Files gallery can know that it's a video, and can attempt to create a thumbnail from FFmpeg.
How will you play it in browser though? I don't think any browsers will support this format, so you will end up with a thumbnail for a video that cannot be viewed.