Hey ​@Veronica Pena, thanks for flagging this! 

I sent this over to our team, and it seems to be related to a bug that they’ve been investigating and working towards a fix. 

I am happy to inform you that the fix has been successfully released. Please refresh your Figma tabs to ensure that you are using the fixed version. If you continue to experience the issue, please let me know, and I will flag it down for further investigation.
 
Thank you again for taking the time to report the issue!

Hi!

Experiencing the same error. Apparently it's still not ok.

yeah, same here. still seems to be an issue. thank you for looking into it! will wait for updates

Same, still experiencing this despite refreshing, restarting and checking for updates etc

Hi everyone, thanks for flagging it! Sorry to hear you are still experiencing the issue.
Can you confirm if you are seeing the issue on both the browser (such as Chrome) and the desktop app?
 
As a first steps, please:

• Close any unused Figma tabs and force-quit your browser or desktop app, then restart it.
• Clear your desktop app cache if you're using the Figma desktop app , and then check if the thumbnails load, You can follow the steps here.

If the issue still persists after trying this, please reach out directly to our support team, this will help our team to take a closer look at your case here: Submit a bug report
In the form, please share a screenshot of how the thumbnails appears, and provide a direct link to one of the files (missing the thumbnail) and invite support-share@figma.com with edit access so the support team can take a look at the file's details (this won’t count towards your billing). Thank you!

Thanks ​@Celine_ - it’s happening in the app and browser for me (Safari and Chrome).

I will raise a bug report in that case :)