Change file size limit of attachments (e. g. PDF-Files)

I want to change the standard file size limit for attachments (e. g. PDF-Files) from 8M to let's say 32M. After applying the changes in the backend of EasySocial and changing the PHP settings of different file size parameters, EasySocial still maintains the 8M limit for e. g. PDF-Files. What needs to be done to get those changes done anyhow?