The new version of iOS 13 has a new style sheet in Safari that has the ability to export as a PDF, Reader PDF (I’m not sure what the difference between the 2 is), and Web Archive. However, from what I can determine it doesn’t have the ability to export to DTTG, because when I choose it, the DTTG dialog box only allows Bookmark, Web Archive and Markdown. Ideally, I’d love the ability to get a single page PDF into DTTG from Safari and other iphone//iPad apps.
I could be mistaken, but I don’t think that is possible with the current version of DEVONthink to Go. I save the page as PDF from Safari to an iCloud Drive folder in Files.app, and from there it’s easy to share the PDF to DEVONthink.
@Greg_Jones is correct here. That is not supported specifically in DEVONthink To Go at this time.
Other workaround - from Safari, in the Share Sheet, choose Print. When you see the print preview, zoom in (via the 2-finger expand gesture) to full screen - you can then use the Share Sheet to send the pads to Devonthink
Problem with this is, that it has problems with links, they are not at the right position or even existing.