Slug-relative link

Hi there!
I have an issue with links to files that i upload to my site. Will try to explain:
My site have folder structure like

├── 01.folder1
     ├── 01.folder2
          ├── default.md
          └── file.zip

I upload zip-file and make link: [file](file.zip). Link href looks good /folder1/folder2/file.zip but leads to the 404 page because folder names has numbers.
How can i force Grav to redirect requests correctly from /folder1/folder2/file.zip to /01.folder1/01.folder2/file.zip?