Cisco WSA - Unexpected uploads

Requête originale, sans modification.

let f_cnt_upload_threshold = 5;
let f_upload_size_threshold = 5000000;
CiscoWSAEvent
| where HttpRequestMethod in~ ('POST', 'PUT')
| where isnotempty(AmpFileName)
| where UrlCategory in~ ('IW_fts', 'IW_osb')
| where DstBytes > f_upload_size_threshold
| summarize count() by AmpFileName, SrcUserName, bin(TimeGenerated, 10m)
| where count_ >= f_cnt_upload_threshold
| extend AccountCustomEntity = SrcUserName