Longblob display is not supported.

We can try to implement it, based on your feedback.

What data do you have in longblob?
1) If longblob contains image, thumbnail of image could be displayed.
2) If longblob contains non-image, there could be download link.

Can you explain about your scenario?

I tested it by setting demo client's table company field to longblob and searching on grid.
It is working as expected. You can test / send me structure + data to check.

if search a row q have a longblob field dont show and error