I am using Marketo but I can't see "New Local asset option" in Marketing@ activities section.
You need to create a program first. This is only available in program.
Can you provide a screenshot ?
Thanks, Michel. Is there any sandbox account for Marketo testing?
Michel is my last name, which is why I sign my posts with Greg
You can only have a sandbox if you buy one, but what is the link with you first question?
Also, and forgive my bluntness, but have you had some training? If not, do not try to learn Marketo all by yourself in a sandbox. You can start with some free training available here: https://www.marketo.com/education/
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