Save screenshot inside saved file

[muit]

Describe the feature requested
Capture and store the screenshot inside the saved file

How does it help the user (you)?
Save games would not depend on external files. A saved game for example can just be copied as a single file.
It may be more performant and easy to control.

Is it related to a problem?
No

[Optional] Propose an approach to the feature (the less we think the better!)
https://mikelis.net/saving-screenshot-other-data-in-unreal-engine/
The post below explains the concept, however there is no need for an actor to be spawned.

[Optional] Additional context
Proposed by @munkeysocks#4373