Import /export Google drive

Is anyone else having issues importing and exporting PDF files between Penbook and Google drive?

I often import PDF Files that contain a meeting agenda into a notebook and then add pages and take notes from the meeting directly into the notebook. I am currently unable to upload the PDF files from my google drive. However, if I download the file from Google to my iCloud Drive and then upload to a Penbook, I have no problem. I am also unable to then export the completed notebook as a PDF to my Google drive-however I can export it to my iCloud. I am hoping to find a way to import and export directly to and from Google drive

Thanks,
Alex