After you optimize Alt image and Filename, you need to check if it works properly. To see results, please try following steps.

1. Check Image Alt Optimization

1. 1 Check on storefront

Go to a page and click the right mouse button.

Click Inspect

Look for alt to check

1.2 Check on Admin

Find the product in the Products section and click it

In Media, click the picture

You will see its Alt

2. Check Image Filename

Go to product page and click right mouse button

Choose Save image as

You will see filename

You can check Image Alt and Filename after you optimize them.

Please email to you have have any issues or questions.