Welcome to the Wefugees Community and thank you for your reaching out to us.
The Wefugees Platform as well as our experts are based in Germany and we usually discuss all kind of topics around life in Germany (especially refugee questions) here. Therefore, I’m afraid that we cannot share much of information in respect to other countries’ migration/residence rules and procedures. What came to my mind first was that it’s probably already difficult to apply for the visa without a passport in the first place. In case you manage and you are planning to leave (please keep in mind that most probably your asylum case will be closed then), it should be possible to get your documents back. I guess the authorities wouldn’t have any interest in keeping them. Maybe other community members can share experience as well.
All the best,