You are probably hitting a limit in advanced settings in Access Policy there is a setting called "Minimum file size for dynamic analysis testing" under Files and Malware Settings. The default value is 15360 bytes, so it means that FMC is not sending smaller files for dynamic analysis.
This document describes how to generate an FXOS troubleshoot file for 2100/4100/9300-series devices
The information in this document is based on these software and hardware versions:
Cisco Firepower 9300 Security Appliance r...
FP URL filtering capability can classify the URLs based on:
Reputation (risk level)
This varies from High Risk (level 1) to Well Known (level 5)
Category + Reputation
If you select a reputation level to allow,...
Cisco Press has published a step-by-step visual guide to configuring and troubleshooting of the Cisco Firepower Threat Defense (FTD). Each consistently organized chapter on this book contains definitions of keywords, operational flowcharts, architectural ...