Why did I lost my data suddenly?

Only some data. I am so worried at that time my phone dropped I think I lost all. I checked available storage is only about 5 GB but I can’t find anything so I restarted my phone. Then available storage is about 35 GB.

No, Especially movies from the Zapya app about 20 GB. Or may it be Zapya error?

How can I get up? Plz help me I don’t know exactly.