Hello there, @EdG2 ...
Full disclosure, I have never used Echo360 before, so I do not know what the capabilities are of that software. This might be a question you'll ultimately have to ask the folks at Echo360 ... because it sounds like you are asking about what kinds of viewing rights someone would have outside of Canvas.
Also, have you tried testing this in a separate Canvas course...such as a sandbox course...and enrolling a dummy account with the "Observer" role to see what would happen once you are in Echo360?
If you do contact the Echo360 folks, please let us know what you find out from them...thanks! Take care...be well.
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