Sir, I have a fancy product designer plugin version 6.1.91 while in this version when I change the image for a product it is not changing from the icon to the image that i had uploaded please let me know your input regarding this issue.

Usually, it is due to a plugin conflict; you need to find the plugin causing the problem, uninstall it, and then try again. If you still can't figure it out, feel free to open a ticket.

https://support.fancyproductdesigner.com/support/tickets/new