If you select this, Google will convert the PDF to a Docs file and open it for you. Content can be edited in Docs, but PDF conversion can be a tricky process.

Google is making a change to what it calls the “First Open Experience” that will launch Docs in edit mode, with Sheets and Slides also getting a “more creation-focused experience.” Opening ...

Steps: Upload your PDF to Google Drive, right-click the file, and select "Open with" > "Google Docs." Google Docs will convert the PDF, enabling you to copy and paste the text.