Hello,

So, to confirm this issue more at the Theme level we have checked our Test Site in real time Mobile view and there uploaded the Image for the Review and it was added fine. Here is the Product from the Test Site on which we tried: https://blackpearlspro.com/woodmart_support/product/test-product/

You can check yourself too on our Test Site. So, this clears the fact that it is not a Theme end issue.

It looks like there is some security system on your server that blocks some types of images from being uploaded on the frontend. Try to contact your hosting provider and ask them to check this function to see if they are blocked by the server or not.

Best Regards