I just imported a stack of posts from my old blog
https://climatecontrarian.wordpress.com/
It’s quite straightforward really. You first create an export file of selected posts at your old blog, download it and then unzip it. Then you go to the Substack import feature, enter the web address of the blog and when prompted open the downloaded file which is on your computer and it should export all the files into your archive.
It looks a bit of a mess to me at the moment, with quite a few files duplicated, and nothing much in chronological order, but anyone interested in climate change scepticism (plus some old posts on Covid) can take a look. I’ll have to go through the posts and see if I can arrange them more logically.
Nice! Thanks for sharing. I'll cross post some of my old one now. I've been wary of WP since they nuked Tim Cullen's Malagabay Bay although that was an error they said.