The Problem
Lets say you receive error something like this
[Sun Sep 02 18:20:45.740026 2018] [:error] [pid 23145]
Solution
Go to var/www/vhosts/CRM-Directory/vtlib/Vtiger/Functions.php. Comment line 594 until 605. It should look something like this
It should solve the problem regarding uploading picture in products. However this is not a solid solution since it’s bypass mime type check and PHP code injection check. But for temporary you can use it. Leave a comment if this method save your day 🙂