Fyromians are clearly of bulgarian origin. Here is an ethnic map from 20th century
Then, their language is clearly a bulgarian dialect, and that is recognized even today:
then if we take a look back to the ottoman Archives, we will see that in 1911 there is not even one "macedonian" but onlq bulgarians/greeks/turks/albanians in macedonia:
If we look back at the history we will see that in the middle ages today FYROM was called "theme Bulgaria"
Even more, the Bitola Inscription of Ivan Vladislav clearly states that he is a bulgarian:
and something more recent:
The bulgarian exarchate:
Macedonia during WW2 was simply Bulgaria:
and a video showing the Liberation of Macedonia: