If you are getting trouble to upload PDF file which size is larger then 10 MB on wordpress you should check your Apache server mod_security configurations. I added some steps abaut how to disable mod_security for Apache Web Server.
Step 1: Check mod_security File
#cat /etc/httpd/conf.d/mod_security.conf|egrep 'SecRuleEngine|SecRequestBodyAccess'
“SecRequestBodyAccess” and “SecRuleEngine” must be “On” if you have enabled mod_security functions.
Step 2: Disable mod_security
Find these two parameters and change them to “Off”
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