Google Drive & One Drive

Hi Insync users,

Before jumping to buy another insync licence, I would like to ask can the same file sync to both google drive and one drive? Any conflicts?

Say I have a file C:\Document\test.xlsx

Local Drive ->> google drive & one drive
When I edit it locally, will the file be synced to google drive and one drive?

One Drive -> Local Drive
When I edit it from one drive, will the updated file be synced to local drive and google drive?

Sames goes to editing it on google drive, will it be synced to one drive?

I am guessing the mechanism will be one drive -> local computer -> google drive

Does that mean if my local computer is offline, then the updated file will not be reflected on google drive?