BigFix don't remove image file OSD

Hello,
When an image is deleted from the Image Library dashboard, the
corresponding wim file is NOT removed from the wwwrootbes\Uploads
folder.
BigFix 9.5.5.193 on windows 2012r2
BigFix OSD 7.1.1.20 290.34

Do you have a fixlet to compare files repository and Bigfix Image Library ? Or other good ideas ?
Thank you
Pierre