I have an issue where the save file dialog does not have previews enabled by default despite them being enabled in Dolphin.
This is somewhat unusual and I have to enable it all the time. I’m using the same settings option in dolphin for all dolphin windows (shared settings), so I would think that this wouldn’t happen.
How can I resolve this?
There is a preview button in the dialog window itself. It looks like a picture frame ─ see the screenshot below. 
In addition to that, the dialog can also be configured with the wrench button on the right in the screenshot.
It looks like you have previews enabled and showing …
Its there on the right hand side … “CHE 132: General Chemistry…”
What I notice on my system though … is that the previews show fine in something like an “Open File” dialog … but a “Save As” from firefox will not, and the option is greyed-out (key F11 also does nothing)
Open file:
Save file as:
Same issue I suppose, F11 does nothing 
