Font Substitution Will Occur Continue ⚡
If you are the receiver, look at the warning box. It often tells you which font is missing. You can search for that font online (many are free on Google Fonts), install it on your computer, and restart your application. The warning will disappear.
When a software application cannot find a specific font referenced in a file, it must use a "stand-in" or default font (like Arial or Simplex) to display the text. This is known as font substitution Missing Font Files: Font substitution will occur continue