Hi zarakorolova,
I assumed you've already turned on your Multicurrency feature. Let me help you out.
The payees of the sales receipts must have a customer profile in the GBP and EUR currencies, so you can upload their receipts. If they don't have a customer profile yet, just enter the currency in the transaction. Then, on the Import sales receipts page, put a check on Add contacts that don't already exist in QuickBooks.

You can download the sample and see the import guide for your reference. The detailed steps are listed in the guide.
Let me know if you have any other concerns with uploading your receipts. Have a good one!