Hi there I-have-a-question-please,
We understand you have a question about some empty folders in the Files app on your iPhone, and we'd like to share a resource that can help.
It is expected for these default folders to appear in Files. You can learn more here: Use the Files app on your iPhone, iPad, or iPod touch
Specifically, the details below may help:
"Find your files
The Files app includes files on the device you're using, as well as those in other cloud services and apps, and iCloud Drive. You can also work with zip files.* To access your files, just open the Files app and choose the location of the file you're looking for."
We hope this helps.