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13 changes: 7 additions & 6 deletions admin_manual/configuration_files/previews_configuration.rst
Original file line number Diff line number Diff line change
Expand Up @@ -16,12 +16,13 @@ By default, Nextcloud can generate previews for the following filetypes:
* Cover of MP3 files
* Text documents

.. note:: Technically Nextcloud can also generate the previews
of other file types such as PDF, SVG or various office documents.
Due to security concerns those providers have been disabled by
default and are considered unsupported.
While those providers are still available, we discourage enabling
them, and they are not documented.
.. note:: Nextcloud can also generate previews of other file types (such as PDF, SVG,
various Office document formats, and various video formats). Due to security and
performance concerns those providers are disabled by default. While those providers
are still available, we discourage enabling them and they are considered unsupported.
The full list of the preview providers that are enabled by default (as well as those
disabled by default) can be found under the ``enabledPreviewProviders``
:doc:`configuration parameter </configuration_server/config_sample_php_parameters>`.

Parameters
----------
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