I would donate some to deltachat / arcanechat, it's a promising project, and maybe if you have local hosting of some federated oss instance that you use, also freecad, but it's and app that I'm using often

Nais :)

The extension change happens when i download the file from signal stickers site, it's detected as webp file despite being an animated png, I've download several stickers and it's a common problem. I can convert it with imagemagick but then increase the size of the file

Ostia... on my mobile this file was a webp, after uploading here it has been changed to apng... maybe it's a apng with the extension changed, because the size is exactly the same, so doesn't seem a conversion... thanks!