Viaje a España

Yes that's possible. However you will need to book seat reservations in advance for all these journeys (extra costs). Spain and RENFE are a pain: most trains are bookable online but some are not.

You will need to plan carefully your itinerary. Same if you were to buy regular train tickets.

Have a look at this great guide (https://www.seat61.com/interrail-and-eurail-reservations.htm) and Rail Europe (click on "add rail pass" to check the price, use Euro currency).

Santiago - Lisbon is best done through Vigo - Porto. Due to frequency on that cross-border line you either have to stop overnight in Vigo or Porto (I'd recommend the latter).

Lisbon - Sevilla is best done by bus. You can take the train to Faro and then the bus but plan sufficient margin in between (ideally 2 hours).

Some trains might be missing from Rail Planner and other planners. Use the RENFE website and don't rely too much on Google Maps (sometimes it is incorrect).

For issues, mention route and travel date.

Thank you so much, I will check all this details asap.