[How do I stop Affinity Designer from downloading cloud content that is simply in a folder where I am try to save a file?]

I store most of my files on OneDrive. Whenever I open a folder from Designer that contains files only on OneDrive, it starts downloading those files. Even though I am not touching the file. Even when I am just saving an image to that folder. How can I stop this? I don't files I'm not using downloaded.

[Epub]

Adding my voice to this. I'd love to see both epub and mobi exports. I was really hoping that would be an option. I know InDesign had epub at least (possibly also mobi).