Cloud
As mentioned previously as of Jan 2025 linear flight route planning is not supported in Flight Hub 2.
However you can still upload/download linear flight routes to the FH2 cloud from the remote controller.
This allows you to plan missions on one RC and send them to another through the FH2 cloud.
Tap and hold a route to enter selection mode and select the routes you want to upload (must be connected to Flight Hub 2). Then click the upload button.
To download tap cloud then tap and hold a route to enter selection mode and select the routes you want to download. Then click the download button.
File Sharing
If you don’t want to connect to the cloud, you could also plan the mission on an RC, export the file on a RC to an sd card in the rc and send it to another pilot via email/file share who could then import it on their RC.