I think someone will backup Roam database into Obsidian, the images can’t export .
In Obsidian, the url is like https://firebasestorage.googleapis.com/v0/b/firescript-577a2.appspot.com/o/imgs%
so, If there’s a download image plugin in Obsidian, It’s really easy for people who Migrating from Roam to Obsidian.