# .pdf thumbnails (previews)

**URL:** <https://syncloud.discourse.group/t/pdf-thumbnails-previews/170>\
**Category:** Access Issues\
**Created:** [21 January 2022 21:05 UTC](https://syncloud.discourse.group/t/pdf-thumbnails-previews/170 "2022-01-21T21:05:16Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![CDubs](https://avatars.discourse-cdn.com/v4/letter/c/3be4f8/32.png) [@CDubs](https://syncloud.discourse.group/u/CDubs)\
**Post date:** [21 January 2022 21:05 UTC](https://syncloud.discourse.group/t/pdf-thumbnails-previews/170/1 "2022-01-21T21:05:16Z")

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how do I enable .pdf (and if possible .cbr/.cbz) thumbnails?  
I’ve ran this “snap run nextcloud.occ preview:generate-all -vvv” but get this error:

[Symfony\ Component \Console Exception\ CommandNotFoundException]  
Command “preview generate-all” is not defined.

with some exception trace that follows.

Thanks for all the help!

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**Author:** ![boris](https://avatars.discourse-cdn.com/v4/letter/b/74df32/32.png) [@boris](https://syncloud.discourse.group/u/boris)\
**Post date:** [21 January 2022 21:42 UTC](https://syncloud.discourse.group/t/pdf-thumbnails-previews/170/2 "2022-01-21T21:42:06Z")

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I guess it is part of this app: [Preview Generator - Apps - App Store - Nextcloud](https://apps.nextcloud.com/apps/previewgenerator)

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**Author:** ![CDubs](https://avatars.discourse-cdn.com/v4/letter/c/3be4f8/32.png) [@CDubs](https://syncloud.discourse.group/u/CDubs)\
**Post date:** [21 January 2022 22:02 UTC](https://syncloud.discourse.group/t/pdf-thumbnails-previews/170/3 "2022-01-21T22:02:16Z")

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That was it, didn’t realize it required an add-on! thanks again!