Dahua NVR5208-8P-4KS2, 6 dahua cameras, 1 not displaying thumbnails in AI search

Dobiwallah

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Hi Guys, just a question,

I have a Dahua NVR5208-8P-4KS2 with 7 cameras connected. 3 via the POE and 4 via the network.
1 camera is a small ebay IPC camera in the mailbox, only to check the mail, no recording.

The others are:
2 HDW3849H-AS-PV
1 HDW5831R-ZE
1 HDBW4800E-S
2 HDW4631C-A

The HDBW4800E-S is too old to have IVS, I accept that, but with all the other I can add tripwires and intrusion. It is only if I go to playback in smart PSS, and search for pictures, all the cameras display the tumbnails, except the small IPC (understandable) the HDBW4800E-S (too old of course) and the and the HDW5831R-ZE.
That's what I don't understand. The tripwire and intrusion show up in the video footage, but not IVS thumbnails. Is this model camera too old for this? or do I miss a setting?
 
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