This was already partially referred here more than 2 years ago: Dolphin not displaying data in audio-related columns
It turns out it is not only for audio it is not working. Because it is quite a useful function shouldn’t it be addressed by KDE already?
Is that solution really recommended? After all even its own submitter was not a fan of it? Would be really good if someone could share some insight on “file indexing” pros and cons, although i am more interested in this working by default in Dolphin. If this is already reported to KDE please say so, couldn’t find it either.