Notion API import puts file attachments into base Vault instead of Output Folder

Thank you for making this importer!

I recently used this to import my notion through the Notion API and found that attached files (e.g. images) were all put in the base directory of my vault and linked to notes as [[xxx.png]] as opposed to the Output Folder. The desired behavior would be creating `_resources/` folder for either the Output Folder subdirectory, or the per stack subdirectories. 