Starting with GoldMine 2015.2 there was an entry in the Release Notes:
• Add and access Links from Cloud storage
- What does this mean and how does it work?
1. Login to your cloud storage provider.
2. Find a document that is desired to link in GoldMine.
3. Obtain URL from Cloud storage provider to access file (usually by right clicking file and selecting an option for the URL or link.).
4. Add the document to the GoldMine links tab and for the path paste the address from step 3 above.