Trying to open a PDF file on Google Docs

I've made a PDF file and its in my Google Drive. I can see and open it. I want to be able to access it from Google Docs.
The only thing I did is upload as choose open file with Google docs on a computer.

When I see the PDF on my phone, no choice of Google Docs is there to open the file with.

How can I.open it or move a copy to my Google Docs?
Or, do I do it on my laptop and then I can see it via the phone's accessing the Google Docs?
Thanks. Not really a phone question. Sorry.

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