File sorting based on numbers. How to force it to use strings

Nextcloud version 11.0.2
Operating system and version Ubuntu 16.04
Apache 2.4.18
PHP version PHP 7.0.15-0ubuntu0.16.04.4

We have a directory of files with names like:

20080401, 3252.pdf
20130528, 3252.pdf
201412174, 3252.pdf
20160328, 3252.pdf
20070405, 3252.pdf
20080402, 3252.pdf
201307236, 3252.pdf
20150504, 3252.pdf
20070510, 3252.pdf
20120123, 3252.pdf

The problem is when I sort by name, it wants to display them like:

20070405, 3252.pdf
20070510, 3252.pdf
20080401, 3252.pdf
20080402, 3252.pdf
20120123, 3252.pdf
20130528, 3252.pdf
20150504, 3252.pdf
20160328, 3252.pdf
201307236, 3252.pdf
201412174, 3252.pdf

The larger number shows up at the bottom.

It seems to be the sort is being determined based on numbers, not strings.

Any ideas how to force the sort to treat all files as strings.

thanks,
Geoff