So far my understanding is that you upload a file via n8n form along with specifying the website from the dropdown list. Then you wish the file to be processed and the content added to the Post DB and linked to the Website DB? How did I do? Is this close to what you are trying to achieve?
What you have described is really what I wanted to achieve. I guess it wouldn’t be possible to fetch the Websites list from to Notion and append it to the initial dropdown so i filled it manually for now, I could be wrong but this is actually how I did.
For the Notion part, I had to use the Get Many Databases, then Filter the result based on the selected value of my initial Select (n8n form). The relation is now well set up