Goog quality animation on Instagram [Non Synfig related]

I created a beatiful animation with Synfig, I exported all frames in .png and created a .gif with Gimp.
I converted with a onlineconverter the .gif in .mp4.
The video is perfect on mobile and widescreen but when I upload it on Instagram is terrible, it loos a lot of resolution.
How can I fix the problem?
Please help I tryed everything possible…

Maybe creating you mp4 file from your png sequence and not from the gif…? :thinking:

Try to use PNG -> APNG instead of GIF to avoid quality loss (GIF is 8bits colors with dithering).

Then send it to instagram to check