I had created prototypes in BUILD(https://www.build.me/ ) and was trying to generate source code in Web IDE. I followed all the steps mentioned in this link:
I was not able to find the BUILD Plug-in in Web IDE and stopped at step no. 4.
This blog is basically how I solved the issue to add BUILD plug-in in Web IDE and generate code from prototype.
I had already added Destinations(Step -3) in Web IDE manually. I added one more destination with the following details:
Destination URL: https://standard.build.me
Proxy Type: Internet
After that, I was able to see BUILD plug-in in Web IDE and completed all the steps to generate the UI5 code of BUILD prototype.