Photoshop is saving thumbnails with the images, and MacOS can normally read most of the extensions images to create its own thumbnails. But there are some MacOS problems that sometimes cause some folders to not correctly show thumbnails for files.
Try to rename the file .JPG or .PNG manually sometimes you can see the file name without extension name so that's why!
Not seeing that on my iMac. Photoshop CC version.
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Just yesterday I was looking some old files from Photoshop. The old thumbnails had no border and the new ones do. It was part of Apple's move to a new way of creating thumbnails. It did take a while for Adobe and Apple to fix the bugs.
So first thing, set up the Finder to report filename extensions on the thumbnails under Finder > Preferences
Then be sure your image files have the proper extension. A jpeg Photo should be Photo.jpg and have that extension or it won't work.
Next, use these settings in Photoshop Preferences to create thumbnails.
You then open your image and make a non-destructive change such as clicking a layer eyeball off and on.
When you save your image, you should see the new thumbnail with the border.
On occasions an image may get the wrong extension. Preview will fix that for you. Open the suspicious file in Preview, save it and it will replace the errant extension with the proper one.
Thank you for the reply, Gene!
Sadly it seems like these steps aren't working for me, on both the .jpg and .psd files, as finder is still just showing the image as a preview and keeps giving me the white border and this as thumbnail:
Still when I open the file in the old Photoshop (CS5.1), is automatically adds the thumbnail when I save the file. Either Finder is unable to read the saved thumbnail from the new photoshop (CC), or it simply isn't saved with the file at all, as opening the file in CC removes it again.....
You may try using the Photoshop in a user account which should have all the Admin rights and check if that helps.
How to create new user account on Mac OS Sierra: macOS Sierra: Set up users, guests, and groups on your Mac
I have the same problem. preview images not saved to thumbnails.
Also modified images saved as new with current date, not as modified with original created date!