characters

@Susy Arredondo Photograph Firefly still has difficulty at times generating legible text. Try Nate's suggestion or use a third-party model inside Firefly. 

Hey @Susy Arredondo Photograph 

This is frustrating for sure. I recommend using Adobe Express to add text to the video. 
1) More flexibity to change the font and move the text.
2) You can add annimation

3) You can add music and such

I made this short vid to help/ show how to add text in Adobe Express
Adobe Express & adding Text

Cheers

Nate