Particle system as brush on Blender 2.83


I have been trying to make @tutor4u’s excellent “fire text” tutorial work on Blender 2.83 to no avail. The particle system simply doesn’t paint the text, and I am not versed at all in dynamic paint in order to bend it to my will. It’s been a few months since I deleted 2.79b, and I would really appreciate some help.

Here is the tutorial:

And here is a link to my blender file:

Thanks, guys, and have a fantastic weekend.