I often want to do something with something I have access to when I have logged into in 1Browser. For example I want to:
I need an "Open in..." option
Thanks for sharing your use case here. We'll look into implementing the Open in options for downloaded files within 1Browser but I don't have a timeframe on when you might see this.
1Password doesn't yet support adding attachments within the iOS app but I would imagine that once we do implement this, the Open In menu should allow you to attach it to a new item or an existing item.