How the hell do you export a service ?

I've seen a lot of UK economic articles talking about exporting services and im confused because how do you provide a service like legal solicitation for someone who is in another country ? , theres no way a lawyer from the UK could represent a german criminal in court without travelling to germany.

Im also quite confused about exporting financial services beacuse cross-border loans are fairly rare and dont see why a german customer would want to hire a portfolio manager from the UK when its literally so much better to hire a german speaking portfolio manager from germany.

Please feel free to educate me on this subject as im very new to the field of economics.