# Mobile UI issue – PDF UI diappears

**URL:** <https://pdfjs.community/t/mobile-ui-issue-pdf-ui-diappears/517>\
**Category:** Technical Support\
**Tags:** pdfjs-express\
**Created:** [February 18, 2021, 10:16am UTC](https://pdfjs.community/t/mobile-ui-issue-pdf-ui-diappears/517 "2021-02-18T10:16:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![srswebsolutions](https://avatars.discourse-cdn.com/v4/letter/s/e56c9b/32.png) [@srswebsolutions](https://pdfjs.community/u/srswebsolutions)\
**Post date:** [February 18, 2021, 10:16am UTC](https://pdfjs.community/t/mobile-ui-issue-pdf-ui-diappears/517/1 "2021-02-18T10:16:41Z")

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**PDF.js Express Version**  
name": “webviewer”,  
“description”: “PDFJS Express”,  
“version”: “7.2.0”,

**Detailed description of issue**  
We are getting a error in Mobile device wile trying for adding Signature  
**Condition 1** : Add New Signature , Draw the Signature , Not Placing the Created Signature , but trying to add the New Signature , The PDF UI be comes Blank

**Condition 2** : Add New Signature , Draw the Signature , Placing the Created Signature, Then Remove Signature , Then Add New Signature , The PDF will disappear

This scenario is found only on Mobile devices

**Expected behaviour**  
Working should be in Normal data flow. Ned to get Signed as in Desktop version

**Does your issue happen with every document, or just one?**  
Every document on mobile , but on desktop it perform smoothly

**Link to document**

**Code snippet**

 ![image_2021_02_01T12_28_16_202Z](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/b602c8f4e43d38ebd0845d311f5642c122000b58.png)

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<div class="post-metadata">

**Author:** ![Logan](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/logan/32/13_2.png) [@Logan](https://pdfjs.community/u/Logan)\
**Post date:** [February 22, 2021, 9:24pm UTC](https://pdfjs.community/t/mobile-ui-issue-pdf-ui-diappears/517/2 "2021-02-22T21:24:10Z")

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Hey there!

I cannot reproduce this issue. Do you have any other custom UI configuration or any code that customizes the UI or signature functionality?

Thank you,  
Logan Bittner

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<div class="post-metadata">

**Author:** ![srswebsolutions](https://avatars.discourse-cdn.com/v4/letter/s/e56c9b/32.png) [@srswebsolutions](https://pdfjs.community/u/srswebsolutions)\
**Post date:** [March 12, 2021, 5:59pm UTC](https://pdfjs.community/t/mobile-ui-issue-pdf-ui-diappears/517/3 "2021-03-12T17:59:05Z")

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We don’t have any custom UI or any UI code Updated , My team was able to replicate this on native code . Anyway let me retest and confirm with you . Thanks for the Support .