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This is the view I get when I want to upload a file to OS X' browser. I like the thumbnail view, but as you can see, they are too small.
I don't mind showing fewer pictures – I just want a bigger thumbnail view.
How can I change that?
Right click inside the window & select 'Show View options' or Cmd ⌘ J
The icon size is adjustable from there.
You can also set it to show icon previews.
I found it, must change file .../user/Library/Preferences/com.apple.finder.plist
FK_DefaultIconViewSettings -> iconSize
Required, but never shown