Hello,
Just to make sure we’re on the same page — the title says it was an accidental download, but you mentioned an accidental deletion. Could you clarify what happened and how you noticed you’re missing media?
Once I understand the situation better, I’ll be able to help you more effectively. In the meantime, I recommend trying to reset local changes. This will make the content of your cards match the AnkiHub website (except for any protected fields):
How to reset local changes