MCA question - replace an image for an email asset

[Renee]

Hi all, 

It would be helpful if someone can explain why the answer 2 is not correct. 

I used this way to replace one image in my email in Marketo and it worked well. 

No idea why it's not a correct way ...

[SanfordWhiteman · Accepted solution]

I think it hinges on the definition of "replace."

If you take that as "change the binary asset represented by the same URL" then you would have to use the literal Replace feature, not create a new asset.

More broadly though, "replacing" an embedded sub-resource doesn't mean you have to retain the same URL. There's even a browser method (document.location.replace) that's specifically for changing the URL. But that's not Marketo-ish enough for this case.