Windows 10: How do I fix PNG thumbnail icons showing a black background in OneDrive Personal?

I create products for teachers and students using clipart. I recently began using OneDrive Personal to house my extensive clipart collection. However, all the PNG icons/thumbnails appear in Windows Explorer with a black background.For example, I have an entire folder of black arrows that with a black background now looks like black rectangles, making it impossible to distinguish the images. And there are thousands.I know it is a problem within OneDrive because if I drag the icon onto the desktop to the right in the screenshot below, the background immediately

:)

 

OneDrive Personal shows images with transparent backgrounds as black

When viewing these in windows explorer, the backgrounds show as black for transparent images. When you have a logo with black text on it, all you see is a black rectangle.



Copying the same file to OneDrive for business or local drive, the rendered preview icon looks normal. The behavior only affects files in OneDrive Personal.

 

Thumbnails not showing after uploading files to OneDrive

Hi,



Thank you for writing to Microsoft Community Forums.



I understand that you are unable to view thumbnails in OneDrive for models. You may refer the steps mentioned in the section
Show image thumbnails and previews from the article
Change views on the OneDrive website and see if that helps.



If the issue persists, I suggest you to contact the OneDrive support team for assistance with the issue. Follow the below steps to contact the OneDrive support team.



Sign in to OneDrive.com from any browser, click the ‘?’ help icon on the top banner of the page and select
Email OneDrive support. Submit your question and follow the prompts to request support.



Regards,

Nikhar Khare

Microsoft Community - Moderator

 

Thumbnails of ICO files down't show up if stored in OneDrive


Ever since Microsoft OneDrive updated to Version 2017 (Build 17.3.7059.0930), all my PDF files that I have stored show thumbnails which never happened before. Great.





However, all my ICO (*.ico) files no longer show thumbnails after they are synched like they used to. Here is a screenshot I took showing the new icons I saved yesterday (which haven't been synched) and older ones that are synched.





How do I get my icon thumbnails back?

What I've already done:

1. Rebuild icon cache (Go to C:\Users\<your username>\AppData\Local\Microsoft\Windows\Explorer; delete all iconcache_*.db files)
2. Icrease size of icon cache (Regedit; KEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer; New String Value "Max cached icons"; Set to 8MB "8192")