How to sync non-picasa folder displayed in Gallery app? I often use Instagram to add effect and frame to my photos.

Then, there is a folder named instagram appearing in Gallery; but that folder won't be synced with my Google account i.e. on another Android device signed in with the same account, I don't see that folder.

So my question is that how I can have it synced?
The gallery is showing the Instagram folder cause it scans the whole device and external storages and grab all folders with images. You can't sync that folder but can share once in a while with Picasa so that process will upload images on that folder to Picasa. And then Picasa will sync that folder to your rest of the devices.