# File thumbnail is empty after upgrading UIKit to 3.11.1

**URL:** <https://community.sendbird.com/t/file-thumbnail-is-empty-after-upgrading-uikit-to-3-11-1/9034>\
**Category:** React\
**Tags:** javascript\
**Created:** [February 10, 2024, 12:03am UTC](https://community.sendbird.com/t/file-thumbnail-is-empty-after-upgrading-uikit-to-3-11-1/9034 "2024-02-10T00:03:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Eueddem\_Kim](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/eueddem_kim/32/2007_2.png) [@Eueddem\_Kim](https://community.sendbird.com/u/Eueddem_Kim)\
**Post date:** [February 10, 2024, 12:03am UTC](https://community.sendbird.com/t/file-thumbnail-is-empty-after-upgrading-uikit-to-3-11-1/9034/1 "2024-02-10T00:03:37Z")

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**[Problem/Question]**  
Hello, I’m trying to upgrade `@sendbird/uikit-react` to the latest version.  
But after upgrade, when I upload image files, their thumbnails are blank - I checked blank thumbnails’ urls, and it seems they’re missing base urls. thumbnails generated before upgrading SDK start with “[https://file-us-3.sendbird.com/](https://file-us-3.sendbird.com/)…”, but new thumbnails start with “?auth=…”. Can you please check what happened? Do I need to change any implementation on my side?

 ![Screenshot 2024-02-09 at 3.54.28 PM](https://us1.discourse-cdn.com/flex020/uploads/sendbird/original/2X/c/c65618aaf06b047dd066e840ef27783b05098ece.png)

And one more, when I upload any image files to group channel with UI Kit 3.11.1, my app with older Sendbird SDK (4.7.2) returns `Cannot read property 'split' of undefined` error on loading messages from the channel via `getPreviousMessages`.

* * *

// If problem, please fill out the below. If question, please delete.  
**[UIKit Version]**  
“@sendbird/chat”: “4.10.8”,  
“@sendbird/uikit-react”: “3.11.1”,

**[Reproduction Steps]**  
Upload images from the web page using UI Kit 3.11.1

**[Frequency]**  
Every time

**[Current impact]**  
Blocks upgrading dependencies

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<div class="post-metadata">

**Author:** ![Eueddem\_Kim](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/eueddem_kim/32/2007_2.png) [@Eueddem\_Kim](https://community.sendbird.com/u/Eueddem_Kim)\
**Post date:** [February 13, 2024, 8:07pm UTC](https://community.sendbird.com/t/file-thumbnail-is-empty-after-upgrading-uikit-to-3-11-1/9034/2 "2024-02-13T20:07:38Z")

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Tested with old versions - it turned out that it happens even with old chat SDKs! Was there any changes in Sendbird server? And once it occurs, I cannot open the channel even from Sendbird dashboard!

 ![Screenshot 2024-02-13 at 12.05.27 PM](https://us1.discourse-cdn.com/flex020/uploads/sendbird/original/2X/1/1e22b08d09bda87171f89ef60dc096d5f0e758f7.png)