Please check the error log

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1

Nextcloud version (eg, 10.0.2):11
Operating system and version (eg, Ubuntu 16.04):centos7
Apache or nginx version (eg, Apache 2.4.25): apache 2.4.6
PHP version (eg, 5.6):7.1.1

There is no problem in using, but I get an error.
Please check the error log

11111.jpg1607×468 189 KB

2

Hmm the shared library for php-xsl module is not found. Did you try to reinstall module and library? apt install --reinstall libxslt1-dev php-xsl or similar command for centos ;).