Looks promising, but works incredibly bad

The plugin is a promising plugin with nice features, but works very bad and lacks of some features that for me are important. For example, instead of to allow to use the default service account in the instance, you have to install the service account JSON which is less secure.
Another thing that lacks is the possibility to continue the syncs or even ignore the errors. If the process fails (which happens all the time), you have to restart the process from the begining. The sync is badly done and it stops without reason. Three days I have lost trying to sync a site and all the time the process stops without even saying why, it just says that has synced one image and nothing else. The plugin just stops saying that is syncing images and the progress bar doesn’t continues, but the plugin still thinking that is “in progress”.

If your site is new then will works fine for you, but If your site already have uploads in local, you will loose your mind trying to upload the files using the sync feature.