Google Drive pdf

When I try to import a pdf file from Google Drive I get this message:

403. That’s an error.

Error: disallowed_useragent

This user-agent is not permitted to make an OAuth authorization request to Google as it is classified as an embedded user-agent (also known as a web-view). Per our policy, only browsers are permitted to make authorization requests to Google. We offer several libraries and samples for native apps to perform authorization requests in the browser.