Official comment
You can do this by installing the desktop version of Google Drive: https://www.google.com/drive/download/
This allows you to quickly access the files in Google Drive in a folder on your computer, and upload them into the File Manager. Other services such as Box and Dropbox have a similar feature.
We are also planning to allow files to be uploaded via a form, for insertion into the File Box for each record. It is on our roadmap but I don't have an ETA for that just yet.
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