Can someone advise me as to the maximum file size limit that Matrix v3.10.3 can manage?
Thanks
Matrix itself can handle files of any size, but usually Apache and/or PHP have a limit set. For example, the default limit on a RHEL system is 2mb for file uploads. You can change this setting by modifying php.ini (and it some cases httpd.conf if Apache has set a POST maximum as well).
You can look under Global Preferences so see what the current limit is. It is listed in the section where you set the maximum file size of files that users can upload for your system.