Solved ISSUE: I cannot upload any themes to vivaldi://settings/themes

[Vivaldiscool]

@Hadden89, as you said:

and link the mp4 animated wallpaper externally (mega/gdrive/ecc) with all its high resolution.

Okay, I'll try that.

Also, converting it as a GIF never was a good idea: the format was born with 256 colors and low frame rates. So, very very poor compression ratio.

.gif file or .mp4?

[Pathduck]

@Vivaldiscool You can't use MP4 files for background images in themes, this was already established.

Can you share the original MP4 file you want to use?

[Vivaldiscool]

It doesn't matter,

I'll just use a theme from theme.vivaldi.net.