Html code not working

I was using image thumbnails of items to better manage the inventory items but as i updated manager 20.8.65 to manager 21.1.32, the image thumbnails are not showing as it was working fine in previous version.the html code is given below

capture-20210120-145757

help needed.Thanks

You need to provide a screenshot of the html code

capture-20210120-203820

You can’t insert local images. The image must be stored at a web-accessible location. See the guide about inserting images.

Can you provide any demo html code for inserting picture.

You can not insert local images. The image must be stored at a web-accessible location. See the guide about inserting images.

Add an image to a custom field | Manager