Cache mp3 files in sub folders

How to create page rule to cache mp3 files on sub folders and sub folders trees, example,
I need to cache mp3 files under directory structure like that

/assets/audio/ many sub folders each sub folder has many mp3 files
/assets/sound/sub folders/each sub folder has another sub folders, and all have mp3

will this rule work:

Browser Cache TTL: a year
Cache Level: Cache Everything
Edge Cache TTL: an hour

or do I need to create a page rule for each sub folder which I can not because they are hundreds.

try*.mp3 instead of*

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