How can I make it so I can right click (Or Long-click in this case) to copy an image using the CustomWebView extension?

(I'm fairly new to MIT app inventor so I would appreciate some patience be allotted going into this. Thank you in advance!)

I'm making an app that allows me to access web views of social medias, (Discord, Reddit, Pinterest, etc.) but I have no way to right click an image or item to copy an image to then be able to CTRL + V it elsewhere.

For example, when the CustomWebView URL is set to discord, I can rightclick to copy an image in one conversation to be able to post it in another view CTRL+ V.

Can anyone show me any pictures of blocks that can help me out?