Creating a Perfect Remote with Tuya Smart IR Universal Remote?

Hey everyone

I have an Acer Projector that did not come with a remote, and I am trying to recreate all functions using this Smart IR Universal Remote controlled by Tuya Smart

When setting it up with Tuya there were 10 template remotes. In most of those the most basic functions work (Turn on & Turn off etc) - but the 2ndary functions do not work well (i.e. change source, volume up etc)

Can I re-create a perfect remote with my Smart IR Universal Remote and if yes - how would I start doing that?

I tried searching for a guide - but was unable to , even though I guess the answer will be obvious in hindsight