Windows 10: Folder Thumbnail Preview Changes?

Hello, I use an external HDD and created various media folders on there. I customized each folder and chose a file to show on the folder icon; however, the problem I get is that the preview seems to change on me. For example, if I view as extra large icons it displays as the correct thumbnails, but if enter a folder and exit, all the folder previews revert to defaults. They are corrected if I change the view size again, but defaults whenever I enter and exit folders.

:)

 

Video preview thumbnails

Hello,

System file corruption is one of the possible reasons why thumbnail preview has recently disappeared. To better assist you, please answer the following:

• For clarification, are referring to video preview thumbnails when using File Explorer?
  
• We would like to verify if you are referring to the Fall Creators Update. To see your
  Windows build and version, please follow the steps in this
  article.
  

In the meantime, we suggest creating a Test User Profile. This is to see if the same issue occurs on a different user profile.

To create a Test User Profile, follow these steps:

• On Search, type Settings then hit the
  Enter key.
• On Settings window, select Accounts.
• Select Family & other people.
  
• Select Add someone else to this PC.
• Name the User Profile as TEST.
• Assign a password for TEST user, then select Next.
• Sign in TEST user.

We'll be waiting on the results.

 

File Explorer not showing thumbnails

Brink,

Many thanks for you reply. I have done all the steps you suggested, but no change,

When I open a folder containing photos, some open correctly but the vast majority open with thumbnails, but they very quickly get overwritten and you can not longer see the thumbnails.

Are there any more suggestions?

 

Preview Pane for Images/Some Thumbnails/Photos not Working Only on OneDrive Folder

The preview pane and thumbnails as well as the Photos app are not working, but only on my OneDrive folder. It works fine on an exact copy of the same files that are not in the OneDrive synced folder structure (and known to Windows as being OneDrive).

• Open OneDrive Folder, navigate to photos directory
• Sony Raw images (.ARW) do not show thumbnails. (I have the Sony plug in installed)
• Double click on a raw file, Photos says "We can't open this file."
• Click on a jpeg file, and with preview window turned on, no preview appears
• Double click on jpeg file, opens fine in Photos, and then the preview window image appears

• Navigate to a directory that is not synced to OneDrive
• Sony Raw thumbnails show up fine. They also show up in the preview window.
• Double click on Raw file and Photos opens it up without problems

• Back to OneDrive photo directory
• Copy raw file to desktop
• Immediately the thumbnail appears and the file can be opened with Photos. The same file that it can't open from Explorer in the OneDrive directory

This is only happening on my desktop. My laptop is fine. Both same versions of Windows 10 Version 1709 OS Build 16299.19