Help opening RSS feed items in archive.is/ links and from last 7 days

I’m trying to automate an iOS Shortcut to open all URLs from an RSS feed in archive.is/[URL], but it’s not working as expected.

Here’s what I’ve done:

I want to schedule this every Saturday at 09:00. But first need the shortcut to work.

The problems:

Only one URL opens in archive.is instead of all of them.

Can’t get it to filter articles from last 7 days only.

Is it possible to open in Firefox (default browser) on my iPad?

What am I doing wrong? Can someone help? Thank you.

I've tried troubleshooting with chatGPT but it keeps giving wrong answers or says this should work.