Document was not stored into upload folder

I uploaded a several of xlsx documents and they dont appear into folder upload, even the file with id in name. Where this files are being save?

those files are stored in /upload/, without a file extension and with a new file name (an uuid related to the database record).

Can you currently download your uploaded files again?

Thnks for reply!
Yes, i can downloaded the file, but the file is not in upload/ folder, the file without extension and a id name, is not there!

I am saving the file from a custom module

There is any other folder?

Is this the Documents module?

Check the database table to see what the file is called. Make sure you understand the structure of Documents / Revisions.

If it is not that module, then exactly what is the file type you’re using?