# Issues using Canvas & navigation blocks on web preview

**URL:** <https://community.thunkable.com/t/issues-using-canvas-navigation-blocks-on-web-preview/1875308>\
**Category:** Issues / Bugs\
**Created:** [May 13, 2022, 9:31pm UTC](https://community.thunkable.com/t/issues-using-canvas-navigation-blocks-on-web-preview/1875308 "2022-05-13T21:31:38Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![eg3p9adla](https://avatars.discourse-cdn.com/v4/letter/e/898d66/32.png) [@eg3p9adla](https://community.thunkable.com/u/eg3p9adla)\
**Post date:** [May 13, 2022, 9:31pm UTC](https://community.thunkable.com/t/issues-using-canvas-navigation-blocks-on-web-preview/1875308/1 "2022-05-13T21:31:38Z")

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## Problem

On my newest projects, when I do a web preview on my app with 2 screens, one with a canvas, the canvas only shows when it is started on the screen with the canvas first.

## Steps to Reproduce

When pressing the button on the app to change screens, which uses a navigate block, going to a screen without the canvas, then navigating back with another button, the canvas does not show up.

## Still works (Canvas appears)

When in web preview, I use the tabs on top to change screens, instead of buttons.  
It does work on mobile app on phone.

Here is a link to the app:

> **[Thunkable](https://x.thunkable.com/projectPage/627e8fc00c6b6a0011bda8da)**

Please let me know if you see this problem and have any solutions.

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**Author:** ![tatiang](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/tatiang/32/55482_2.png) [@tatiang](https://community.thunkable.com/u/tatiang)\
**Post date:** [May 13, 2022, 11:27pm UTC](https://community.thunkable.com/t/issues-using-canvas-navigation-blocks-on-web-preview/1875308/2 "2022-05-13T23:27:00Z")

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Yep, I see what you mean. It works fine in Thunkable Live on my iPhone but not when previewed in a browser. The Canvas doesn’t show up.

It could be related to this:

[Difficulty with Canvas and Screens in the Web Preview · Issue #1133 · thunkable/thunkable-issues · GitHub](https://github.com/thunkable/thunkable-issues/issues/1133). I would recommend you post a comment there and include a link to this topic.

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**Author:** ![eg3p9adla](https://avatars.discourse-cdn.com/v4/letter/e/898d66/32.png) [@eg3p9adla](https://community.thunkable.com/u/eg3p9adla)\
**Post date:** [May 14, 2022, 12:15am UTC](https://community.thunkable.com/t/issues-using-canvas-navigation-blocks-on-web-preview/1875308/3 "2022-05-14T00:15:17Z")

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Yes, looks like the same issue.

Stunning nobody else is bringing this up.

 ![image](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/a/7/a75567c9ddca5f0f1156da65828c3c02cffecb71.png)

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<div class="post-metadata">

**Author:** ![eg3p9adla](https://avatars.discourse-cdn.com/v4/letter/e/898d66/32.png) [@eg3p9adla](https://community.thunkable.com/u/eg3p9adla)\
**Post date:** [May 14, 2022, 12:43am UTC](https://community.thunkable.com/t/issues-using-canvas-navigation-blocks-on-web-preview/1875308/4 "2022-05-14T00:43:16Z")

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Comment posted on Issues list on Github as well.

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**Author:** ![system](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/0/f/0f59f292712368bce16ff80133ae10de8a6f27e8.png) [@system](https://community.thunkable.com/u/system)\
**Post date:** [August 12, 2022, 12:43am UTC](https://community.thunkable.com/t/issues-using-canvas-navigation-blocks-on-web-preview/1875308/5 "2022-08-12T00:43:28Z")

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