The text input field for the image associated with a Rich Media content asset is for some reason limited to URLs explicitly ending in DOS-style filename extensions (the kind which, in older times, were conventionally associated with images; e.g. ".jpg"). However, not every image URL on the internet ends in ".jpg". Databases and CDNs, for example, may serve images at perfectly valid image URLs that don't end in ".gif" or ".jpg". The MIME type, file header, or 'Content-Type' HTTP header should instead be used to check that an image is an image.
For example, this is a perfectly valid image URL: https://uberflip.cdntwrk.com/files/aHViPTYzODY3JmNtZD1pdGVtZWRpdG9yaW1hZ2UmZmlsZW5hbWU9aXRlbWVkaXRvc...
Marketo, can you please fix the image URL field validator for RTP content/assets so the image is validated based on whether it is an image, instead of whether the URL ends in ".jpg"?
As seen above, your very own asset list displays the very images it simultaneously declares are invalid.
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