Upvote:2
Under EC261, when there are delays or cancellations, you may have several different rights, including:
Assistance (also called care): that means the airline should reroute/rebook you, provide the opportunity for a refund, and take care of you in the process if there are long delays, including meals, hotels, transfers, etc. This stops at the point where you get to your final destination.
Compensation: that means that if you are severely delayed at your final destination, you will get a lump sum compensation. This is independent of any costs you may have to bear. It may be much more than those costs, it may be much less, but it's fixed and pre-determined.
Any additional costs once you arrive at your (planned) destination are not covered by EC261. So if you have to take a taxi when you had planned to take public transport, or if you miss a train, or if you paid for a night in a hotel and you can't use, all of that is not covered explicitly. Hopefully the compensation will cover it, but in some cases it might not.
Any receipts for hotels, meals, etc. are normally only for what is covered by the right to assistance. That's for instance meals if you were delayed long enough (at the origin or at a connection airport), hotel nights if you were delayed overnight, transfers to/from the hotel, etc. Many airlines have strict policies about those: you should contact them, and they will give you vouchers or somehow arrange for the service to be provided, rather than let you pay for all that and then reimburse you. Even in the latter case, they usually have limits on what they will refund (no, you usually can't dine at a Michelin-starred restaurant at the airline's expense).
So if you want to be refunded for incidentals during your trip, provide the receipt for the meal. I'm not sure where/when you used the Uber, but I don't expect that to be covered.
The right to assistance is valid even if the issue is not the airline's fault. There are a number of other parameters that are different from the right to compensation (the thresholds for the delays, etc.).
What you seem to be interested in is the compensation. The amount is fixed, and is completely independent of any costs. It is computed like this:
In you case the distance is 997 km, so the compensation will be 250 €. And that is indeed per passenger, though the procedure is normally that this is paid to each passenger, so the airline may require you to file multiple requests. Start by re-stressing that there were 2 passengers on the PNR, and see how that goes.