How to add a simple external web link into Bookmarks in Scrivener IOS?

Someone, anyone, please help me figure out how to add an external web link into bookmarks in the IOS version of Scrivener. I see the the bookmark ribbon at the bottom of the edit window, which only bookmarks the doc you’re looking at. What I want to do is copy/paste a browser URL as a new bookmark. In the desktop version you simply drag the address to the bookmarks pane, but in IOS I’m danged if I can figure out how to do something/anything similar. Thx in advance for your help.