How to download .mp4 fils on our online store

hi, is it possible to download and use .mp4 files on a online store - Our last upgrade is 4.9.2 - 4.9.2.SP1

Try to enable the Attachments module and upload .mp4 file with on the Update product page in the admin panel

Thanks for the proposed solution,
Sorry for the trouble, but can you give us the step by step solution, becouse we can’t find the right place in the admin panel ?
Thanks in advance for Your help.

try this