Base64 Error

[Geobop]

I started creating SVG images with Illustrator some time ago and just finished a book (epub) that I want to sell on Kindle. But when I tried publishing my book to Kindle, I got the following error:

Base64 Embedded Images are not supported in Scalable Vector Graphics (SVG). --

Please use our suggested alternative found @ https://enhancedtypesetting.s3.us-east-2.amazonaws.com/en_US/guidance/layoutfeatures/guidance.html#s...

I don't have a clue what any of this means, nor does it specify which image needs to be fixed. Is there a simple way of 1) tracking down SVG files that have Base64 problems and 2) fixing them? Or do I need to convert all my SVG images to PNG's?

Thanks.

[Met1]

Isn't this a question for Kindle/Amazon?

[Geobop]

You want me to ask Kindle what Base64 is and how to purge it from my images???

[Monika Gause]

So you have placed raster images in SVG files? Why not place them directly into your book?

[Geobop]

So are you saying Base64 indicates a raster image? If so, that's a good tip. I can go back and check to see if I accidentally pasted a raster image into those images.