DCS for MSO365 -- Opening PDFs with direct links

We've installed DCS for MSO365 into our Sharepoint Online tenant, and it seems to be working.  If I'm in Sharepoint Online I can click Open > Open in Adobe Document Cloud, and the web based PDF editor opens the document.  It also does so when I simply click on the link.  However, if I send somebody a link to the PDF, or put a link to the PDF on a webpage and the user clicks that link, the PDF does not open in Document Cloud -- it just opens in the regular browser PDF reader, despite being hosted in SPO.

Is there a way to format the link such that it opens in Document Cloud?  In particular, I have an Angular app that reads the SPO library and produces a list of links to documents in that library.  Links to Word/Excel files are returned from SPO and formatted such that when the user clicks them, the documents get opened in Office 365, but any link to a PDF doesn't seem to invoke the Document Cloud viewer.

Alternatively, is there a way my app can pass the link to SPO and use it to open the PDF in DCS?

Thanks!