Hi @Anonymous ,
Please check your restricted entry folder for test files.
Judging from your screenshot, [Get file] did not retrieve the file
Here is a test:

I limited the entry folders

Here is bot test:
Flow is succeeded

Bot test is succeeded
if the file is in this folder, it can get fileURL

if the file is not in this folder, it cann't get fileURL

Best Regards
Cheng Feng