Final answer:
The size limit for images and files uploaded to Marketo is 50 MB. This applies to individual files that are part of marketing campaigns to ensure optimal loading times for users.
Step-by-step explanation:
The size limit for images and files uploaded to Marketo is 50 MB. This limit applies to individual files, meaning each file you upload must not exceed this size. When working with Marketo, it's important to optimize images and other content to not only stay within this limit but also to ensure that your marketing campaigns load quickly for users.