Is is possible to work on a game whilst offline?

From the "Recording Review" screen

This screen cannot be used while being offline.

From the "Recording Breakdown" screen

You can work on your recording without an Internet connection, provided that you have previously downloaded the necessary data. This means that you will be able to watch game sequences and add tags to them. You will simply have to synchronize your tags with our database later on once you will have an Internet connection.

To do so:

1. Go to the "Recording Breakdown" screen.
2. Press the cloud icon as displayed in the picture below (in the bar that perform actions for all filtered sequences).
3. Select Download to launch the download of all video sequences from that recording.
4. Video sequences are downloaded when the cloud icon next to them has disappeared.

Please be aware that downloading all the video sequences from a game can take a long time.

Note that you can choose to download only parts of the recording, either by downloading sequences one by one, or by adding filters in order to download only a list of sequences.