How to allow upload of specific compressed file extensions

Hey @kopeboy

Drupal core provides the functionality to add and restrict the file upload to certain extensions.
In your case, you wanted the file upload only to support .yml.tar.gz. For this, you can simply add the said extension to Allowed file extensions of File upload.
Add extension:

And for uncompress, the resultant will be the same how the file is compressed. For example, 1 file (test.yml.tar.gz) uncompressed result will be test.yml