The System Image in your first picture does not show a snapshot of the endpoint, that's a fixed image that you can store in TMS for that particular endpoint.
You could use that option to take a snapshot of the endpoint, but with TC7.3.6 or the CE8.x software releases, this is no longer possible and reports an error "The snapshot property on the system has to be set to 'On' to be able to take snapshot" - but, this settings no longer exists since the introduction of the "Remote Monitoring" option key.
The same with the snapshots that previously showed on the Call Status screen. They were there before TC7.3.6/CE8.x, but have been broken with the newer releases - I'd say a similar cause as to the above was the root of this issue, TMS is likely looking for the "websnapshots" setting which no longer exists in the newer software.
I logged an SR with Cisco back on 3 May 2016 about this, and it has been logged as bug CSCuz63654.
Note: the websnapshots (aka RemoteMonitoring) feature has been broken in one form or another since before TC7.1 - there are a number of threads on this throughout the forums - see some of these include:
Given that the majority of the earlier TC7.x software releases have all been deferred, you'll need to downgrade to TC7.1.4 and be subject to all the other issues in that version if you want your snapshots back in a supported software release, or wait for the fix (unless you have a copy of the firmware file for one of the deferred versions are are prepared to cope with those possible security issues).
Wayne
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Wayne
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