I have created SPFX Project and created Masterpage in classic view and hosted it already in SharePoint online and when I add my SharePoint framework Web parts to the master page after 2 days cannot edit anymore on the save or do any actions from SharePoint ribbon however my master page works fine at SharePoint online, SO after a lot of searches I found all people use Modern View but in the modern view, I cannot do any branding to my portal
is there any way to fix this problem or Doc to how to create a master page in the SharePoint framework?