There are some options when handling huge attachments.
NOTE: Please be advised that uploading attachments with huge size would consume system resources
1. To expand the java heap space of Tomcat
Set the Java Options:-Xmx of Apache Tomcat Properties to a larger value
i.e. increase -Xmx parameter from 256MB to 512MB
2. To split the attachment file.
Users could split a huge attachment into parts before uploading to Service Manager.
HP recommends that one attachment file should be <10MB, or to split a huge attachment file into <10MB files each.
3. To set the limitation of attachments in Service Manager.
Login to Service manager as falcon or operator with "system administrator" role.
Go to Menu navigator > System administration > Base system administration > Miscellaneous > System Information Record > General Tab
Specify a value for "Max Attachment Size" field
Please check https://softwaresupport.hp.com/group/softwaresupport/search-result/-/facetsearch/document/KM00933024 for more details.
Note:about the Max attachment file size value ,customer should test on their system (based on Java heap size memory) and find the optimum value .