Hi, @pklaschka! Thanks a lot!
I was kind of hoping the answer was that.
My solution was to prefix the SVG files I import and then identify them by name. For example: all of my icons start with “icon_”.
But it would be great if the XD team added this functionality to automatically mark all bitmaps and SVGs to be exported. I am working with two documents that have thousands of layers and it is very difficult to keep checking these type of assets all the time to be exported every time I change or add something to the document.