I have a simple plane with an image sequence (215 frames) I want to texture paint on, each image.
But texture paint goes to pink as soon as I click to paint it.
I tested with the same plane with a static image and it works. Issue is only when it’s an images sequence.
Refresh is only done if I also import the sequence as a texture and hit the refresh button, because there’s no refresh in the material properties:
https://youtu.be/m7nejGIlenk
After searching here and there, reading an old post (Can i create an image sequence in texture paint mode?) it seems that it used to work but is not working anymore.
Or did I miss something important? 
Here’s a blend file, just render a sequence and attach it, we can’t pack an images sequence:
untitled.blend (563.8 KB)