Glue integrates with Field by sharing the model. With Docs you should be able to share Folder or documents to Field. This would solve the issue of uploading to multiple platforms.
Also if this connection is made you could link Field and Doc issues together. Either by a push or a Sync. Competitors are doing this very well and easy. A Mark-up should also be able to be upgraded to a formal issue for tracking in field not attach a drawing and then mark it up. Docs handles this much better than field.