Another very common issue, Corrensa users face is that the some of the files they are trying to attach to the Vtiger through Corrensa fails to attach. When user attach it to the Vtiger it keeps on loading and file is not attached
Here is a video showing the issue
The reason behind this issue is the size of the file that you want to attach exceeds the maximum file size that is configured in Vtiger configurations
Usually the maximum file size that is configured in the Vtiger is 5 MB. You can check it by going to settings and selecting the configuration editor
By default, the Vtiger only allows to configure this size ranging from 0 to 5 MB. It can be increased.